If you need to fetch Azure AD groups or e.g. calculate total count of AAD groups via MS Graph API in PowerShell you may use Powershell-MicrosoftGraph project on github. At first you need to clone repository locally and copy it's folder to local PowerShell Modules folder:
git clone 'https://github.com/Freakling/Powershell-MicrosoftGraph' Copy-item -Path "Powershell-MicrosoftGraph\MicrosoftGraph\" -Destination ($env:PSModulePath.Split(';')[-1]) -recurse -force
We will make Graph requests using app permissions. It means that you need to have registered AAD app with permissions Groups.Read.All for fetching the groups:
Copy clientId and clientSecret of this AAD app and tenantId of your tenant (you may copy it from Azure portal > Azure AD overview tab). Having all this data in place run the following script:
$appID = "..." $appSecret = "..." $tenantID = "..." $credential = New-Object System.Management.Automation.PSCredential($appID,(ConvertTo-SecureString $appSecret -AsPlainText -Force)) $token = Get-MSGraphAuthToken -credential $credential -tenantID $tenantID (Invoke-MSGraphQuery -URI 'https://graph.microsoft.com/v1.0/groups' -token $token -recursive -tokenrefresh -credential $credential -tenantID $tenantID | select -ExpandProperty Value | measure).Count
It will output total count of groups in your AAD.