In the articles below I’m sharing my techniques on searching in Microsoft 365 SharePoint and Teams from application using Microsoft Graph API.
Specifically I’m covering

• Microsoft Graph search API
• Microsoft.Graph PowerShell module
• PnP.PowerShell module

In two flavors:

• Search on behalf of currently authenticated user
• Unattended Search with daemon (also called service) applications

Index of my articles on the subject:

• Search Microsoft 365 content programmatically: Index
• Search Microsoft 365 content programmatically: Use-case scenarios
• Authentication to Microsoft Graph:
  Azure Registered Apps Authentication Platform configuration, Certificates and Secrets
• Authorization to Microsoft Graph: Azure Registered Apps API permissions
• Calling Microsoft Graph Search API from code as current user
• Calling Microsoft Graph Search API from daemon/service app
• Using Microsoft.Graph PowerShell module to Search in Microsoft 365
• Using PnP.PowerShell module to Search in Microsoft 365

Video tutorials

• Search Microsoft 365 Programmatically – PlayList
• Calling MS Graph Search API from PowerShell with Interactive Authentication
• Calling MS Graph Search API from PowerShell with App Authentication
• Search through Microsoft 365 Teams and SharePoint with PnP.PowerShell module
• Search through Microsoft 365 Teams and SharePoint using Microsoft.Graph PowerShell