Demo showing how to query Azure AD in PowerShell. Walk each step with full PowerShell source code available.
1) Execute "Connect-AzureAD" with admin user
2) Create self signed certificate PFX for unattended login
3) Create new App Registration
4) Grant permission "User.ReadAll" to MS Graph API
5) Execute "Connect-AzureAD" with unattended certificate PFX login
6) Execute query "Get-AzureADUser" to display results
Please leave comment with suggestions and questions. Cheers.