Update from Mar 5, 2023: Microsoft confirmed this as valid solution.

Scenario

You want specific users do not appear in Microsoft 365 SharePoint, Teams or Delve search results.

Solution

Set “ShowInAddressList” Azure AD User object property to false. If users are synchronized from local AD – set AD property instead.

Detailed

In many cases we do not need some accounts appear in Microsoft 365 Search. Examples of are:

a) secondary/admin accounts
e.g. a person have several roles and several accounts under the same name, e.g.
regular user: John Smith John.Smith@contoso.com
administrative account: John Smith John.Smith.2@contoso.com
b) role, shared or service accounts
c) non-mail-enabled objects
d) disabled accounts

Getting multiple results for the same one person might confuse users and even lead to miscommunication and broken processes.

There is a good article by Tania Menice (Microsoft): Exclude Users From Delve and SharePoint Online People Search with the latest updates explaining how it is done for classic search and stating that currently it is not possible for modern search, but Microsoft is working on it.

Basically, the article says:

• Set the profiles AD property msExchHideFromAddressLists to True or Yes,
• Sync/wait, so finally SharePoint UPA service SPS-HideFromAddressLists property will be set (msExchHideFromAddressLists AD property is mapped to the UPA SPS-HideFromAddressLists)
• Under SharePoint classic search – update query:
  {searchboxquery} to {searchboxquery} -“SPS-HideFromAddressLists”:1

It works perfect for classic search. The problem is it does not work as expected in modern Microsoft Search.

“People” vertical is not customizable so far. So we cannot change query in Microsoft 365 search to do the same trick. But… it seems like Microsoft is working on it so finally it should be done by ootb means.

Here is the current situation on how different services or search entry points respect SPS-HideFromAddressLists property:

Microsoft 365 Service or Search Entry point	respect SPS-HideFromAddressLists (msExchHideFromAddressLists)
web Outlook “New message” user picker	Yes
web Outlook “Contacts”	Yes
Office.com “All” vertical	Yes
Office.com “People” vertical	No
SharePoint landing page “All” vertical	Yes
SharePoint landing page “People” vertical	No
Bing Work All Vertical	Yes
Bing Work People Vertical	Yes

So only “People” vertical in Microsoft search does not respect SPS-HideFromAddressLists (msExchHideFromAddressLists).

What about cloud-based accounts (not synchronized from local AD)?

There is a configuration setting “Show in global address list” that does the same job. It’s under Microsoft 365 admin center -> Active Users -> User – Edit -> Mail -> Show in global address list:

And another configuration settings “Hide from global address list (GAL)” under Exchange Admin Center:

Here are experiment results:

User Account	1	2	3	4	5
Enabled	Yes	No	Yes	Yes	Yes
Licensed (E5)	No	Yes	Yes	Yes	Yes
m365 Admin Center: Show in Global Address List	n/a	No	No	Yes	No
Exchange Admin Center: Hide from global address list (GAL)	n/a	Yes	Yes	No	Yes
Get-AzADUser -UserPrincipalName <upn> -Select ShowInAddressList -AppendSelected | Select-Object UserPrincipalName, ShowInAddressList	null	null	null	null	False
SPO UPA ‘SPS-HideFromAddressLists‘ value	False	False	False	False	True
Outlook Address List “All Users”				Shown
Office.com Search: Vertical “All”				Shown
Office.com Search: Vertical “People”	Shown	Shown	Shown	Shown
Bing Work Search: All/People verticals	Shown			Shown
Teams Search: “All” Vertical	Shown			Shown
Teams Search: “People” vertical	Shown		Shown	Shown	Shown
Microsoft 365 Profile card – Organization	Shown			Shown
Teams Profile card – Organization	Shown	Shown	Shown	Shown
Teams People Picker	Shown		Shown	Shown	Shown
SharePoint People Picker				Shown
Outlook People Picker:				Shown

It seems confusing we have properties:

• “Show in Global Address List” under m365 Admin Center
• “Hide from global address list (GAL)” under Exchange Admin Center
• “ShowInAddressList” Azure AD User object property
• “SPS-HideFromAddressLists” SharePoint User Profile property

Are these properties related to each other?

Let’s test it:

Action-Consequences (immediate reaction – minutes if not other mentioned)	“Show in Global Address List” under m365 Admin Center	“Hide from global address list (GAL)” under Exchange Admin Center	“ShowInAddressList” Azure AD User object property	“SPS-HideFromAddressLists” SharePoint User Profile property
New user created, license assigned	Yes	Off	null	False
Uncheck “Show in my organization address list” under Microsoft 365 admin center	No	On	after one minute: null after 24 hours: null	after one minute: False after 24 hours: False
Set “ShowInAddressList” Azure AD User object property to “True”	Yes	Off	True	False
Set “ShowInAddressList” Azure AD User object property to “False”	No	On	False	True

Note: Az module works fine too. I.e. Get-AzADUser instead of Get-AzureADUser and Set-AzADUser instead of Set-AzureADUser.

Findings:

• “Show in Global Address List” under m365 Admin Center and “Hide from global address list (GAL)” under Exchange Admin Center – same switch, i.e. if you change one – another is updated automatically
  Neither of them affect “ShowInAddressList” Azure AD User object property or “SPS-HideFromAddressLists” SharePoint User Profile property
  and vise versa (???)
• “SPS-HideFromAddressLists” SharePoint User Profile property is not changeable.
  If you try to change the property value you get an error message:
  “Set-PnPUserProfileProperty : Property Not Editable: This property can not be modified.“
• “ShowInAddressList” Azure AD User object property is editable and synchronized to “SPS-HideFromAddressLists” SharePoint User Profile property (takes minutes)
  but then search crawler must pick this change up (takes hours) to hide/show the user
• here Microsoft says: regarding showInAddressList – Do not use in Microsoft Graph. Manage this property through the Microsoft 365 admin center instead. Represents whether the user should be included in the Outlook global address list. See Known issue.
• Known issue (Microsoft): showInAddressList property is out of sync with Microsoft Exchange. When querying users through Microsoft Graph, the showInAddressList property may not indicate the same status shown in Microsoft Exchange. We recommend you manage this functionality directly with Microsoft Exchange through the Microsoft 365 admin center and not to use this property in Microsoft Graph.

Bottom line

Setting “ShowInAddressList” Azure AD User object property to “false” is the most effective way to hide user account from search, but it could be changed only through API e.g. via PowerShell and Microsoft’s vision is unclear.

Video tutorial

Here is the video tutorial on the same – excluding account from people search in Microsoft 365

References

• Microsoft: Exclude Users From Delve and SharePoint Online People Search
• Microsoft: IMicrosoftGraphUser.ShowInAddressList Property
• Microsoft: Microsoft Graph user resource type
• Vladilen: Search and Refine against custom user profile attributes
• Vladilen: Microsoft 365 People Search by Nickname