Shared mailboxes automapping broke and cannot be removed after hybrid migration
We migrated a user from Exchange to Office 365. The shared mailbox is still on premises in Exchange. The full access is working and i can see that the user can still open the mailbox via OWA (open another mailbox). This user had the mailbox automapped to his Outlook and after migrating him, his Outlook will no longer open the automapped mailbox. When we try and remove the full access permissions and the automapping from the mailbox on prem it will not remove from Outlook. (We need to delete his Outlook profile and recreate to get rid of it) Since it thinks it is automapped, we cannot remove the mailbox from his Outlook. Even after removing it via powershell on prem. Since the mailbox is already added to his Outlook. We cannot go to account settings and force the mailbox to be added to the profile again. Thoughts? We will eventually move the shared mailbox to Office 365. But there are a lot of users accessing this mailbox. We cannot migrate it until we are ready for the rest of the users?
