When performing a manual AD sync, the following message is returned:
“The procedure seems to have been successful… Proceeding to the Users List tab to double-check…”
Upon checking the Users list it seems no new users have been added.
When this message is displayed it usually means that user capping is enabled to enforce the license limit, but the in app notifications or email is not enabled. So when then AD Sync is triggered, it detects the license breach and fails silently.
You can either add more licenses, remove user capping, or add in app notifications for user capping for better diagnostics.