AAD upgrade from v1 to v2 need to pay attention items (Post check items)

1. Need to check the "Domain and OU filtering" under Azure Active Directory Connect is it include all users OU
2. After the upgrade complete and full sync complete, go to M365 admin center (Users -> Deleted users) to check if there are any users being move to "deleted user" (Soft-deleted), if yes, go to Synchronization Service Manager to check log profile name "Export", to see if there are any "Deletes". If there are no. of deletes,  go back to "Domain and OU filtering" under Azure Active Directory Connect to see any "deleted user" under deselected OU. (To resolve this issue, add back the deselected OU, run full sync (Start-ADSyncSyncCycle -PolicyType initial) and run delta sync (Start-ADSyncSyncCycle) on AAD. User account will back to active user on AAD

AAD upgrade from v1 to v2 need to pay attention items (Post check items)