A new feature for Azure AD access reviews allows Microsoft 365 tenants to check for inactive guest accounts in group memberships. It’s useful functionality if your Microsoft 365 groups are used for Teams rather than Outlook groups. Email activity is ignored by these access reviews, so all guest members are deemed to be inactive!
You can create an Azure AD Access Review for all guests in teams and groups in your tenant and then see what’s happening with the Graph API. In this case, we use PowerShell with the API to grab the access review data and create a report about the overall status of the review in a tenant.