If you are using Azure AD and the time passes you’ll have a lot of old device entries. If you enable the automatic device cleanup rule in Microsoft Intune the device is only removed within MDM and the Azure AD entry still exists. Intune device cleanup rule For this reason I created a tiny PowerShell snippet to create a report with all devices which didn’t contact your Azure AD tenant since the treshold date specified....
If you want to assign Microsoft licenses to your Azure AD users e.g. Microsoft 365 E3 licenses you can do this with group based licensing as described here. The problem is that even with group based licensing the UsageLocation property for each user must be set individually. Update: 13.01.2019: Since group based licensing is GA the tenant location is used if no UsageLocation is set on a user object. Use this guide if you want to manually assign licenses or override the tenant settings if you need to configure different UsageLocations....