Synchronization is one-way only, from on-premises AD to AAD. Creating a user directly in AAD will never result in a corresponding object being created on-premises.
New User Not Syncing
I have just added a new user in AAD (as I no longer seem able to add a new user in our on-premise SBS) but this user is showing as 'directory synced = no'. So I cannot log this user in on the LAN. Can anyone explain what step I'm missing to have this user account synced please?
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Marilee Turscak-MSFT 34,046 Reputation points Microsoft Employee
2020-11-07T21:34:53.067+00:00 @Vasil Michev is correct. User Writeback is not supported for Azure Active Directory. You will need to create the users first in your on-premises directory and sync them to Azure.
The user writeback preview feature was removed in the August 2015 update to Azure AD Connect. If you have enabled it, then you should disable this feature.
https://learn.microsoft.com/en-us/azure/active-directory/hybrid/how-to-connect-preview
https://learn.microsoft.com/en-us/azure/active-directory/hybrid/how-to-connect-sync-whatis