Is the AD account on-prem?
If so, then all you need to do is enable the remote mailbox for it like you do for the others.
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Hello,
We are having the hybrid Exchange Environment where we are creating mailboxes using Enable-Remotemailbox command from Exchange Onprem Hybrid Server which sync and create mailbox in Exchange Online but by mistakenly we created a mailbox on Exchange Online Directly (by assigning a Exchange Online License to the synced user before syncing the mailbox) so how we can fix this issue?
Regards,
Raj
Is the AD account on-prem?
If so, then all you need to do is enable the remote mailbox for it like you do for the others.