https://blogs.technet.microsoft.com/enterprisemobility/2017/08/09/automated-expiration-for-office-365-groups-using-azure-ad-is-now-in-public-preview/
https://blogs.technet.microsoft.com/enterprisemobility/2017/08/09/automated-expiration-for-office-365-groups-using-azure-ad-is-now-in-public-preview/