SAM – DAG – Content Shared with EEEU – Access Review

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This article is for SharePoint or Microsoft 365 admins focusing on governance and information protection. If you have SharePoint Advanced Management (SAM) – aka SharePoint Premium licensed or you got at least one Copilot for Microsoft 365 license (as having m365 Copilot license automatically enables SharePoint Advanced Management in tenant), then under reports – Data access governance (in SharePoint admin center) – you can not only get Content shared with ‘Everyone except external users’ (EEEU) reports, but also initiate access review. Let us look more closely at this functionality and discuss the pros and cons..

I’ll not repeat Microsoft documents:
– SharePoint Advanced Management
– Content shared with ‘Everyone except external users’ (EEEU) reports
– Site access reviews for Data access governance reports
but I’ll focus on what is not there and a real-world experience.

Reports and emails

You can share content with EEEU or directly – by adding EEEU to resource permissions directly or by including EEEU into SharePoint group. So content shared with EEEU reports come in two flavors – “Specific files, folders and lists” and “Site membership”

“Specific files, folders and lists” user experience

When you initiate access review from the “Specific files, folders and lists” type of report – users (site admins/owners) get email notification that says “You have sites with specific files, folders or lists shared with ‘Everyone except external users’. This means everyone in your organization has access to this content. Review the items shared for potential oversharing and manage their access.“

Scrolling down, in the email, site owner can see a list (table) of incompliant sites with the following columns: Site name, privacy, sensitivity, external sharing and “Items shared”. Site name is clickable and sends user to the root of the site.

Below the list of sites there is a button “View shared items” that sends user to the special system page –
“https://orgname.sharepoint.com/teams/site01/_layouts/15/siteaccessreview.aspx/<id>” where he/she can see list of SharePoint items shared with EEEU. Columns are: (item) Name, Shared on (date), Shared by (email), Action (manage access). Item name and manage access are clickable.

If item is a library item – e.g. document – it is displayed correctly – with icon according to the doc type and doc name. Clickin on the doc name – an actual document opens so you can review it’s content.

If item is a list item – it is displayed incorrectly – no icon, no meaningful info about the item (it is displayed as “”). Clicking on the link – a warning icon and message “Can’t preview this file. Open the file or download it to view in your desktop app”. Buttons “Open” and “Download” are there but not helpful as well.

Clicking on “Manage access” opens almost standard “Manage access” dialogue you can have via “manage access” item context menu, but with no “…” more options at the top right:

which makes this dialogue screen useless, as you can only provide additional access to the item or remove all access. You cannot remove EEEU from access without three dots “More options”.

“Stop sharing” literally remove all permissions to the item except owners

By clicking on a group name – admin opens standard SharePoint “People and Group” membership page:
/_layouts/15/people.aspx?MembershipGroupId=X, which is nice.

“Site membership” user experience

In the case with a “Site membership” report, text would be slightly different: “You have sites where ‘Everyone except external users’ has been added to the site membership. This means everyone in your organization has access to this site. Review site permissions for potential oversharing and manage access.“, which makes sense.

Right after that, in the email, site owner can see a list of incompliant sites with the following columns: Site name, privacy, sensitivity, external sharing and “Groups with org-wide access”. Site name is clickable and sends user to the root of the site.

Then there is a button “View SharePoint groups” that sends user to the special system page –
“https://orgname.sharepoint.com/teams/site01/_layouts/15/siteaccessreview.aspx/<id>” where he/she can see list of SharePoint groups (clickable) with EEEU as members. By clicking on a group name – admin opens standard SharePoint “People and Group” membership page:
/_layouts/15/people.aspx?MembershipGroupId=X, which is nice.

siteaccessreview.aspx page

User can navigate directly to the reviews page:
“https://orgname.sharepoint.com/teams/site01/_layouts/15/siteaccessreview.aspx” and if there were reviews initiated by SharePoint admins – and it’ll work – admin will see all access reviews initiated for this site – columns are: Review name, Description, Requested on (date), Status, reviewed by (email) and admin comment. In case no reviews were initiated against tie site – “You have no reviews to take action on” will be displayed. That’s good.

GUI only

Once you got report – you can initiate access review. All must be done in GUI, click-click-click selecting sites… But what if you have thousands? There is no PowerShell cmdlets or API for this functionality, which really limits your ability to implement it gracefully, especially in large Microsoft 365 environments and automate it.

Download detailed report

Report “Specific files/folders/lists…” does not include files, folders, list – i.e. it does not include what exactly is shared with EEEU. Report includes site id, url, name, template, is it teams-connected, sensitivity (?), privacy, external sharing, primary admin name and email, and number of items (?) shared with EEEU.

So technically you can communicate to site owners, but you’d need to rely on them to figure out what content is shared with everyone.

Email template

When you initiate Site access review – an e-mail notification is send to site owners. This e-mail is not customizable at all. The only admin can do is to add a message (for every “initiate Site access review” action).

This email comes from “SharePoint Online <no-reply@sharepointonline>” address (not customizable), so comes “from outside of your organization” and can be considered as scam.

Microsoft’s logos and other graphics are blocked by default and e-mail includes a button “View shared items” – enough red flags for users to consider it as spam. Keep this in mind.

The good news is e-mail contains site name – so site owner can recognize it at act accordingly.

Usage scenarios

Small tenants

In small Microsoft 365 environments – yes, this functionality probably can be used “as is” (and should be used).

Medium-size tenants

Depends on your governance rules and company culture.

Enterprises

In large environments, where you probably have a lot of overshared content, I would doubt this functionality is useful “as is”. In enterprises usually all the communication must follow approved templates, dealing with tens of thousands site owners should be automated etc.

SharePoint Advanced Management

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SharePoint Advanced Management is an add-on to Microsoft 365. Microsoft says that it is a powerful suite of tools for IT admins to bolster content governance throughout the Microsoft Copilot deployment journey. Let us have a closer look at what SharePoint Advanced Management (SAM) is how exactly it helps with governance enforcement in the Copilot era.

Microsoft classifies SAM’s features as “Manage content sprawl”, “Manage content lifecycle”, “Manage permissions and access”. I’d put SAM’s tools into these buckets: Reports, Policies, Search, Features.

SAM Reports

Reports are something that provides you with data, so you can analyze these date and use them to build/update your own governance strategy and maybe take some immediate action. Reports available are:

  • Change history reports
    you can choose org-wide or site-level settings, specify date range, sites and all or specific admins
  • Enterprise App Insights
  • OneDrive Accounts report
  • Data Access Governance (3 different ones)
    • Sharing Links with 3 pre-configured reports:
      Anyone links, People in your org links and Specific People links shared externally
    • Sensitivity labels applied to files: select label -> generate report
    • Content Shared with Everyone Except External Users:
      to discover specific sites whose content was made accessible for EEEU
      you can choose from two types of report: where specific files/folders/lists are shared with EEEU or “Site membership” where EEEU was added as a member and initialize access review
      (see Deep Dive into SAM DAG Content shared with EEEU access review)

SAM Policies

Policies allows you to set some governance rules, so that rules will be applied automatically, with no or little your intervention. SharePoint Advanced Management policies are:

  • Site Lifecycle management: Inactive Site Policy. Allows:
    • identify inactive sites
    • send notifications to site owners and/or admins
    • automatically archive or make sites read-only (or do nothing – just report)
  • Site Lifecycle management: Site Ownership Policy
    (not available at this moment)

AI Insights – report feature that uses a language model to identify patterns and potential issues and provide actionable recommendations to solve issues

Features

Features are smaller that policies, more like an update to existing functionality.

  • Conditional access to SharePoint site policy
    This enhances existing conditional access Entra Id feature with the ability to apply the policy to SharePoint sites directly or via Site sensitivity label.
  • OneDrive access restriction
  • SharePoint site-level access restrictions
  • Block download policy
  • Your recent actions
  • Default sensitivity labels for document libraries
  • Site access review

SAM for Search

I put it separately:

  • restrict discovery of SharePoint sites and content
  • Restricted SharePoint search

TBP

Microsoft 365 admin center displays incorrect sensitivity label

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Found an issue in Microsoft 365 – it seems like if a sensitivity label is not published for a user – this user will see inconsistency when different sources display sensitivity label differently.

Scenario: A site/group sensitivity label was created under the Purview center. Label enforces some settings to the group/site, like privacy and external sharing. User cannot assign label to site/group until label is published to that user. In this scenario sensitivity label was published to the admin1 but not published to the admin2.

Admin1 assigned sensitivity label to a group-based site.

What admin2 can see in this case is:

ProductSensitivity Label
Teams correct sensitivity label
SharePoint Site correct sensitivity label
My Groups – Groups I Own – View experiencecorrect sensitivity label
My Groups – Groups I Own – Edit experienceno label
SharePoint Admin Centercorrect sensitivity label
Teams Admin Centercorrect sensitivity label
Microsoft 365 Admin Center – Teams&Groupsno label
Entra Id – Groupsno label

Moreover, in some cases you could even see incorrect sensitivity label under Entra Id…

Microsoft says it’s by design. For me this kind of design simply does not make sense.

There is a Design Change Request:
https://feedback.azure.com/d365community/idea/4246b7a8-2119-f011-9d47-7c1e52d4bdd3

If you think this behavior must be changed – please vote for the DCR.

Below are some screenshots:

In particular,

Tableau Cloud Connection to SharePoint

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Recently I helped one client to connect his Tableau Cloud to SharePoint, so let me share how it’s done, as Tableau documentation was not very helpful, so I had to do my own research.

What you’d need is:

  1. Your Tableau Cloud site location
  2. Azure App Registration (Entra Id), configured properly
  3. OAuth Client configured at the Tableau site settings

Having these steps done – you should be able to connect to data (SharePoint or Onedrive site or SharePoint list).

Here are the details…

Your Tableau Cloud location

You need it to build a Redirect URI. Tableau documentation says:

...Note the pod your Tableau Cloud site is located to ensure you enter the correct redirect URL during the registration process in Step 2 below. The redirect URL uses the following format:
https://<your_pod>.online.tableau.com/auth/add_oauth_token
For example, https://us-west-2b.online.tableau.com/auth/add_oauth_token

So, you would check this part in bold of your Tableau cloud instance:
https://us-west-2b.online.tableau.com/
and construct a Redirection URI:
https://us-west-2b.online.tableau.com/auth/add_oauth_token

Examples are:

https://10ay.online.tableau.com/auth/add_oauth_token
https://dub01.online.tableau.com/auth/add_oauth_token
https://us-east-1.online.tableau.com/auth/add_oauth_token

Azure (Entra Id) App Registration

You need an App Registration under Entra Id, with API permissions consented and Authentication configured

API permissions must be the following: Under Graph API, delegated Files.Read.All, Sites.Read.All, User.Read, offline_access:

Authentication blade. You’d add platform: Web and use Redirect URI as above. Example:

Secret

Secret you’d generate under App Registration Certificates and secrets:

Once secret is generated, copy the secret value in a safe place and do not share it.

Also, get your app id and tenant id (those are not secrets but I still prefer not to share):

At this moment you should have from your App registration:

  • Tenant Id
  • Client (App) Id
  • Client Secret
  • Redirect Url

Now we are ready to configure

OAuth Client at the Tableau Site Settings

Having Site Admin permissions (Tableau Site Admin, not SharePoint), you should be able from the left menu navigate to the bottom “Settings” and under General tab scroll down to the “OAuth client registry” and click “Add OAuth Client”.

You’d need two OAuth client configured – one for “OneDrive and SharePoint Online” and the other one for “SharePoint List (JDBC)”.

“OneDrive and SharePoint Online” Experience is:

Here your OAuth instance Url would be:
https://login.microsoftonline.com/<Teanan tId>/

e.g.:
https://login.microsoftonline.com/332d223e-c55f-4c38-af69-214fe2a73f0a/

Client Id, Client secret and Reirect Url you can get from Step 2.

“SharePoint List (JDBC)” experience:

Same here.
OAuth instance Url is: https://login.microsoftonline.com/<your tenant id>/
Client Id, client secret and redirect Url you get from Step2.

Now you are ready to connect…

Tableau Connect to Data: OneDrive and SharePoint Online

Connecting to Data from Tableau, you’d select “OneDrive and SharePoint Online” or “SharePoint List (JDBC)”

Connecting to “OneDrive and SharePoint Online” – you’ll be asked to provide “OAuth Instance Url” again:

So, again, you’d put your tenant Id instead of “common”. After connected, you’d see something like this:

Under OneDrive (personal files) – you’d see your own content located at your personal OneDrive site.
Under OneDrive (shared with you) – you’d see content shared with you and located at other’s personal OneDrive sites.
Under SharePoint sites – you’d see content of SharePoint sites you have access to – all content – documents, lists etc.

Connecting to “SharePoint List (JDBC)” – experience would be

So, you’d provide a specific site collection Url (not list), e.g.
https://contoso.sharepoint.com/teams/Test-Site-01
and you’d provide “OAuth Instance Url” again, just remember – replace “common” with your Tenant Id.

In both cases you should get a pop-up authentication window – provide your credentials after that you should be able to see data in SharePoint.

Possible error messages

Client secret

Client secret is an essential part. It is not market as required in the form, but without secret connection is not working. You can get something like this:

Tableau received an OAuth error from your request. Please see the error message for more information: 401 Unauthorized POST https://login.microsoftonline.com/—/oauth2/v2.0/token. (errorCode=170006)

Reply address

If you did not configure Authentication at your App Reg or configured incorrectly – you might get error message “Sorry, but we’re having trouble signing you in” “AADSTS900971: No reply address provided.”


Solving Issues with m365 Copilot Agents

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Issue # 1 – Unable to create

It says “Unable to create” and “We were unable to create this agent due to an error. Try again.”
or
“Unable to update” and “We were unable to update this agent due to an error. Try again.”

Unable to create We were unable to create this agent due to an error. Try again.
Unable to update We were unable to update this agent due to an error. Try again.

More info:
The problem appears to be when copilot tries to save agent (POST to https://powervamg.us-il105.gateway.prod.island.powerapps.com/chatbotmanagement/tenants/…/environments/Default-…/minimalBots/api/…/publish – it returns 500 Internal Server Error).

Cause:
In my case the cause was my license was assigned a few hours before, so it seems like it takes some time for Microsoft to populate updates.
In the other case I troubleshooted it turned out user did not have a license assigned (license was removed), but “Create an agent” button was available.

Solution:
Ensure you have a license for Microsoft 365 copilot assigned and (ideally) wait 24 hours.
Microsoft: “If you recently purchased a license or started a free trial, it may take up to 24 hours for the license to take effect.”

Python connect to SharePoint via Graph API with Delegated Permissions

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Below is the sample Python code to authenticate against Microsoft 365 as current user with MSA library and to call Microsoft Graph API – specifically get SharePoint Site, get Site lists with requests library.

But first, you have to have an App Registration in Azure (Entra ID) with delegated permissions consented and authentication configured.

Delegated Permissions

If your solution needs access to all SharePoint sites – consider Sites.FullControl.All or Sites.Manage.All or Sites.ReadWrite.All or Sites.Read.All depending on access level you need. Effective permissions would be a min from both – permissions configured for app registration and permissions current user have. Once consented at the app registration – these permissions will work right away.

If your solution needs access to one (or a few) SharePoint sites – consider Sites.Selected API permissions as it will scope down access to only sites that are required for your solution to work. Remember, Sites.Selected API permissions, even consented at the app registration, does require second step – SharePoint admin should provide (read or write or manage or fullcontrol) permissions for the app registration to a specific site or sites.

Authentication

You’d also need to configure authentication blade. How? It depends on the kind of application you are building etc. For example for native apps I do:
– add platform – “Mobile and Desktop app”
– select “https://login.microsoftonline.com/common/oauth2/nativeclient”
– select “msal096fd951-7285-4e4f-9c1f-23a393556b19://auth (MSAL only)”
– add custom Redirect URI: “http://localhost”

This config works for Python code below

Python Code

You’d need to install/import the libraries: json, configparser, msal, requests

Here is the code:

import json
import configparser
import msal
import requests

config = configparser.ConfigParser()
config.read('config.cfg')
client_id = config.get('delegated','clientId')
authority = config.get('delegated','authority')
scopes = config.get('delegated','scope').split()
siteId = config.get('delegated','siteId')
print( client_id)
print( authority)
print( scopes)
print( siteId)

global_token_cache = msal.TokenCache()
global_app = msal.PublicClientApplication(
    client_id,
    authority=authority,  # For Entra ID or External ID
    token_cache=global_token_cache,  
    )

def acquire_and_use_token():
    # The pattern to acquire a token looks like this.
    result = None
    result = global_app.acquire_token_interactive(scopes)

    if "access_token" in result:
        print("Token was obtained from:", result["token_source"])  # Since MSAL 1.25
        # print("Token acquisition result", json.dumps(result, indent=2))
        return result["access_token"]
    else:
        print("Token acquisition failed", result)  # Examine result["error_description"] etc. to diagnose error
        return None


token = acquire_and_use_token()


http_headers = {'Authorization': 'Bearer ' + token,
                'Accept': 'application/json',
                'Content-Type': 'application/json'}

graph_url = 'https://graph.microsoft.com/v1.0/sites/' + siteId + '?$select=id,webUrl,displayName'

siteResponse = requests.get(graph_url, headers=http_headers)
print(siteResponse.status_code)
site = json.loads(siteResponse.content)
# print("Site (raw) : ")
# print(site)
print("Site webUrl : ", site["webUrl"])
print("Site displayName : ", site["displayName"])

# Lists
graph_url = 'https://graph.microsoft.com/v1.0/sites/' + siteId + '/lists'
listsResponse = requests.get(graph_url, headers=http_headers)
print(listsResponse.status_code)
lists = json.loads(listsResponse.content)
# print("Site lists (raw):")
# print(lists)
print("Site lists:")
for list in lists["value"]:
    print("  Display Name:", list["displayName"])
    print("   Id:", list["id"])
    print("   Web Url:", list["webUrl"])
    print("   Created Date:", list["createdDateTime"])
    print("   Last Modified Date:", list["lastModifiedDateTime"])

Application permissions

If your scenario is to call Graph API from Python with application permissions (aka unattended or daemon app) – the main difference is authentication. It is described here. It also requires App registration configured like this.

Azure ACS retirement: Track down ACS apps

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Since Microsoft announced retirement of legacy Azure ACS – all SharePoint admins are working against the clock. ACS permissions were here for 10+ years and there are tons of videos and blogs guiding users how to get these permissions and use it in apps. And imagine how many ACS apps are still there accessing SharePoint sites. We do not want business screams “My critical process stopped working! Do something right now!”. So we would get the list of such apps that are still using ACS to access SharePoint, get apps owners, sites and sites owners. The ultimate goal is to communicate to right people and let them know that ACS is deprecated now and engage them to update their solutions to use only modern authentication.

What kind of apps we are talking about, specifically? I can see the following options:

  1. Apps that were registered in SharePoint via AppRegNew.aspx (aka SharePoint app-only service principals) and provided with permissions in SharePoint via AppInv.aspx
  2. Apps that were registered in Azure (Entra Id) and provided with permissions in SharePoint via AppInv.aspx

Techniques we can use to get data:

  • analyze audit log to get events where apps are accessing sites
  • analyze audit log to get events where ACS permissions were provided to sites
  • get data from system that tracks request for new ACS permissions
  • use reports from admin center
  • use the PnP Microsoft 365 Assessment Tool 
  • get report on apps owners and permissions from from Entra Id

Let us deep dive into each data source to see if it is actually helps us to get ACS apps in use…

Audit log: apps accessing sites

Microsoft 365 audit log is supposed to save all events happening in Microsoft 365. It is available for admins via GUI, PowerShell Exchange Module and Graph API. GUI Search m365 audit log now lives under Microsoft Purview – Solutions – Audit.

GUI search Audit Log under Purview

Unfortunately, when an App registered in Azure and provided with ACS access (via appinv) is accessing SharePoint sites – no events are saved in m365 audit log.

SharePoint app-only principals (apps registered in SharePoint via appregnew) are tracked in m365 audit log. Events would have a UserId “app@sharepoint” (yes, single user id for all apps). Other event details would include activity/operation (PageViewed, FileModified etc.), Item (full Url of a document or page etc.), AppAccessContext (includes ClientAppid, ClientAppName), ApplicationId (yes, this is how we know what app access what url on the site), and many other details

Get Audit Log via Microsoft Graph API

The following reports are available in preview only (under beta):

Service principal sign-in activity

This report is available through the servicePrincipalSignInActivity resource type and details the sign-in activity for a service principal in your tenant. The sign-in activity can be delegated or application-only scenarios. For application-only scenarios, the application credential activity provides additional information on the credential usage.

Service principal sign-in activity report provides the following details for every service principal:

  • id,
  • appId,
  • lastSignInActivity,
  • delegatedClientSignInActivity,
  • delegatedResourceSignInActivity,
  • applicationAuthenticationClientSignInActivity,
  • applicationAuthenticationResourceSignInActivity

More on Service principal sign-in activity

Application credential sign-in activity

This report is available through the appCredentialSignInActivity resource type and details the usage of an app credential (secret, certificate, or federated identity credential) in your tenant.

Application credential sign-in activity report provides the following details for every service principal credential:

  • id, keyId, keyType, keyUsage,
  • appId, appObjectId, servicePrincipalObjectId,
  • resourceId,
  • credentialOrigin,
  • createdDateTime,
  • expirationDateTime,
  • signInActivity

More on Application credential sign-in activity

Application sign-in

Evaluate the usage of application sign-ins in your tenant using either a summary report or a report that provides details of sign-ins, such as the number of sign-ins and whether any errors occurred during sign-in.

Application sign-in report provides the following details for every service principal:
aggregatedEventDateTime, appDisplayName, appId, id, signInCount, status

More on Application sign-in

Audit log ACS permissions provided events

This is relatively easy. There are just 3 kinds of events that might help us to understand ACS usage in tenant:

SharePointAppPermissionOperation

Pull audit logs with record type is SharePointAppPermissionOperation so you’d get events where permissions were provided to apps. Operation type (activity) would be like AppPermissionGrant.

Microsoft started logging this record type not long ago and there is no documentation found (as of Feb 2025). So the only I noticed that might help is:

  • if user id is “app@sharepoint” – that indicates Sites.Selected permissions were provided to the app
    (e.g. via Grant-PnPAzureADAppSitePermission )
    under “AppId” you’d have an app (client) id of the client app (permissions provided to) in the form of
    “i:0i.t|ms.sp.ext|<appId>@<tenantId>”
    under “ApplicationId” and “AppAccessContext – ClientAppId” – you’d have an app (client) id of the admin app (permissions provided via)
    ApplicationDisplayName would contain the display name of the admin app
    Other fields: RecordType 205, UserType 5, AuthenticationType OAuth
  • if user id is one of your actual user’s account in tenant – that indicates ACS permissions were provided to the app (e.g. via appinv.aspx page at SharePoint site)
    under “AppId” you’d have an app (client) id of the client app (permissions provided to) in the form of
    “i:0i.t|ms.sp.ext|<appId>@<tenantId>”
    there would be no “ApplicationId” field and under “AppAccessContext” no ClientAppId
    ApplicationDisplayName Unknown
    Other fields: RecordType 205, UserType 0, AuthenticationType FormsCookieAuth

Appregnew.aspx and appinv.aspx

You can pull audit logs with record type is SharePoint and activity type (operation) is PageViewed and keyword for free search is appregnew. You’d get events when there was an attempt to register a new SharePoint app-only service principal.

The same but with appinv as a search keyword – to get events when there was an attempt to provide ACS permissions for a SharePoint app-only service principal or for an Azure App registration.

In both cases we know that there was an intention to have a principal with an ACS access. We can reach these people to inform that ACS is deprecated and so and so. Worst scenario – we notify somebody who already know that.

Some time ago (around mid – 2023) Microsoft by default disabled ability for site owners registering apps and providing permissions in SharePoint via Appregnew.aspx and appinv.aspx. So since then only SharePoint service admins could provide ACS permissions to apps. In this case you’d check with your request tracking system – to whom ACS were provided.

System that tracks request for new ACS permissions

In case you have a process of providing ACS permissions… Process might include tickets to service desk or similar kind of system… Anyway – check if you can get data from that system – like who requested for what app to what site etc…

Reports available at admin center

So far the only report that might help is in development (see Microsoft 365 Roadmap – feature Id 417481) and scheduled to be available in March 2025.

“Enterprise Application Insights is a powerful report which helps SharePoint Administrators to discover all the SharePoint sites that are allowed access by third-party applications registered in your tenant. The report also provides details on the application’s permission and requests count to help admins take further action to strengthen the security of the site. It is part of SharePoint Advanced Management capabilities.”

The feature is already documented here: Generate App insights reports and is seems like the report will not be available for all tenants – but just for tenants with Microsoft SharePoint Premium (SharePoint Advanced Management) or Copilot license assigned.

PnP Microsoft 365 Assessment Tool 

Microsoft 365 Assessment Tool is an utility designed by PnP team a while ago and since then serves SharePoint admins very well. In particular, it helps helps us identify and evaluate the Azure ACS usage for tenant by providing the usage data of ACS principals, and even generating a Power BI reports.

If you run this tool specifying AddInsACS mode, it provides you with:

  • classicacsprincipals report that includes apps with Allow AppOnly permissions.
    Details are: App Ids, if the app has Tenant or Site Collection Scoped Permissions, RedirectUri, AppDomains and ValidUntil
    If the ValidUntil field contains specific date – that means the app was registered via appregnew
    If the ValidUntil field contains “01/01/0001 00:00:00” date – that means the app was registered in EntraId
  • classicacsprincipalsites – sites these apps have access to
    Details are: AppIdentifier, ServerRelativeUrl
  • classicacsprincipalsitescopedpermissions – list of apps permissions to sites
    Details: AppIdentifier, ServerRelativeUrl, SiteId, WebId, ListId, Right (Read/Write/FullControl/Guest etc.)
    If the WebId field equals zeros, that means rights were provided to entire site collection
  • some other details

Unfortunately, this tool does not provide when the app was last time authenticated or when the app accessed the site

I use the following PowerShell to start the tool, get status and export reports:

$tenantDomain = "" # "contoso.sharepoint.com"
$clientid = "" # 
$certThumbprint = ""
$certPath = "My|CurrentUser|" + $certThumbprint

./microsoft365-assessment.exe start --mode AddInsACS --authmode application --tenant $tenantDomain --applicationid $clientid --certpath $certPath

./microsoft365-assessment.exe status

./microsoft365-assessment.exe report --id <report id> --mode CsvOnly --path ".\ACS-reports"

Highly recommended: SharePoint Add-In and Azure ACS Assessment

Report on apps owners and permissions from from Entra Id

Using all the methods above – you’d get a list of active service principals that use legacy ACS authentication. But to whom we need communicate to regarding this service principals? Obviously, we need this service principals owners. There are multiple options how to get an app owner from Azure (Entra Id):

More Observations

Test scenario 1
DisableCustomAppAuthentication is true, i.e. ACS are not allowed in tenant.
SiteOwnerManageLegacyServicePrincipalEnabled -s false, i.e. site owners cannot register apps at sites or provide permissions to app on sites.
It is not possible for admin to go to appregnew.aspx and create an app (app-only spn).
I registered apps in Azure.
It is possible for admin to go to appinv.aspx and “provide” permissions to the azure app registrations.

An app is shown under appprincipals.aspx only in case if ACS access was provided to app but Sites.Selected access was not provided. The moment you provide Sites.Selected access for the app to the site – the app disappears from list of apps under appprincipals.aspx page. The app is not visible for Get-PnPAzureACSPrincipal. PnP M365 Assessment Tool also fails to get list of ACS apps if the samr also has Sites.Selected permissions. It does not help if you remove Sites.Selected permissions. This issue is reported to Microsoft and confirmed. Microsoft is working on it.

Connect-PnPOnline works with certificates or with secrets.
Get-PnPSite works only if connection was made with a Certificate (if connection was made with secret – it gives 401 unauthorized).

Test scenario 2
DisableCustomAppAuthentication is false, i.e. ACS are allowed in tenant.
SiteOwnerManageLegacyServicePrincipalEnabled -s false, i.e. site owners cannot register apps at sites or provide permissions to app on sites.
Connect-PnPOnline and Get-PnPSite works with certificates or secrets if ACS access was provided for an app to at least one site.
If there was no ACS permissions provided for the app – Get-PnPSite gives “Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))”

Error messages and possible fixes

“Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))” – happens if you try to access SharePoint API with an Entra Id app registration that have an API permissions but do not have legacy ACS permissions being authenticated with a secret.
Solution option 1: try authentication with a certificate.
Solution option 2: use Microsoft Graph API.

“The remote server returned an error: (401) Unauthorized.” – happens if you try to access SharePoint API being authenticated with a certificate with an app registration that do not have modern API permissions correctly provided.
Solution: ensure app registration is configured with SharePoint API permissions.

“(403) Forbidden” – happens if you try to access SharePoint API being authenticated with a secret with an app registration that do not have modern API permissions correctly provided.
Solution: ensure app registration is configured with Graph API permissions.

“AccessDenied”,”Either scp or roles claim need to be present in the token.” – happens if you try to access Graph API being authenticated with a secret with an app registration that do not have modern API permissions correctly provided.
Solution: ensure app registration is configured with Graph API permissions.



References

SelectedOperations.Selected permissions in SharePoint

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Microsoft says “Initially, Sites.Selected existed to restrict an application’s access to a single site collection. Now, lists, list items, folders, and files are also supported, and all Selected scopes now support delegated and application modes.”. This article deep-dives into providing and using SelectedOperations.Selected granular permissions to SharePoint:

Lists.SelectedOperations.SelectedProvides application access to a specific list
ListItems.SelectedOperations.SelectedProvides application access to one or more list items, files, or folders
Files.SelectedOperations.SelectedProvides application access to to one or more files or library folders

Set of SelectedOperations permissions is exactly what Microsoft promised a few years ago. And this is great, as we really need granular access to SharePoint sites. I’ve been supporting enterprise SharePoint for more than 10 years now, and I know that it was always a concern when application require access to a list/library or a folder or even document, but admins have to provide access to entire site.

Especially, I believe, this feature becomes more in demand because of Copilot for Microsoft 365. As for now – it’s mostly developers and data analytics who needs unattended application access to SharePoint, but what if regular users powered with m365 Copilot license start creating autonomous agents?

So below is my lab setup, PowerShell scripts and guides with screenshots on how to provide granular (not to entire site but to library/list or folder, or even just one document or list item) permissions to SharePoint and how to use provided permissions.

Admin App

First, we need an Admin App – an app we will use to provide permissions.

The only requirement – this app should have Microsoft.Graph Sites.FullControl.All API permissions consented:

Target Site and Dev Setup

For this lab/demo setup, I have created a team under Microsoft Teams (so it’s a group-based Teams-connected SharePoint site), then test list and test library:

There must be an App Registration for client application – application that will have access to Test-List-01 and Test-Lib-01 only. This app registration should have Microsoft Graph “Lists.SelectedOperations.Selected” API permissions consented:

and I will use Python to access SharePoint programmatically.

At this moment (we have a client app and secret, and “” API permissions, but did not provide for this app access to specific sites or libraries) – we should be able to authenticate to Microsoft 365, but not able to get any kind of data (we can get token, but other call to Graph API would return 403 error – Error: b'{“error”:{“code”:”accessDenied”,”message”:”Request Doesn\’t have the required Permission scopes to access a site.”,):

PowerShell script to provide selectedoperations.selected access for an app to a specific list would be as below. Here we use plain calls to MS Graph API. Full script for your refence is available at GitHub, but here is the essential part:

$apiUrl = "https://graph.microsoft.com/beta/sites/$targetSiteId/lists/$targetSiteListId/permissions"
$apiUrl 
$params = @{
	roles = @(
	    "read"
    )
    grantedTo = @{
        application = @{
            id = $clientAppClientId
        }
    }
}
$body = $params | ConvertTo-Json
$response = Invoke-RestMethod -Headers $Headers -Uri $apiUrl -Method Post -Body $body -ContentType "application/json"

Client Application

I use Python console app as a client application. Link to the code at the GitHub is shared below under References, but the core part of the Python code is (I do not use any Microsoft or other libraries here, just plain requests to Microsoft Graph for authentication and for data):

import requests
import json
from secrets import clientSc, clientId, tenantId, siteId, listId 

# specify client id, client secret and tenant id
# clientId = ""
# clientSc = "" 
# tenantId = "" 

apiUri = "https://login.microsoftonline.com/" + tenantId + "/oauth2/v2.0/token"

body = {
    "client_id"     : clientId,
    "client_secret" : clientSc,
    "scope"         : "https://graph.microsoft.com/.default",
    "grant_type"    : "client_credentials" 
}

try: 
    response = requests.post(apiUri, data=body)
    token = json.loads(response.content)["access_token"]
except:
    print("Error: ", json.loads(response.content)["error_description"])
    exit()

print("Got token: ", token[0:10], "...")
headers={'Authorization': 'Bearer {0}'.format(token)}

# Get specific site list
print("Geting specific site list")
# graph_url = 'https://graph.microsoft.com/v1.0/sites/' + siteId + '/lists/' + listId
graph_url = 'https://graph.microsoft.com/beta/sites/' + siteId + '/lists/' + listId
graphResponse = requests.get(   graph_url, headers=headers )
print(" Response status code: ", graphResponse.status_code)
if graphResponse.status_code == 200:
    list = json.loads(graphResponse.content)
    print(" List display name: ", list["displayName"])

Note.
I’m not sure if it’s a bug or my incorrect setup, but I noticed that if I provide access for the app to the list – app can read site.

TBC…

References