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Undelegated mailboxes wont stop auto mapping to User
Hi Everyone, Stumped with this one (and it seems Office365 Support are too), I thought I would give it a try here. The environment used to run on Exchange 2013 On premise, now runs 365 Synced...
You can try using the –ClearAutoMapping flag for Remove-MailboxPermission, I've posted some examples here: https://www.michev.info/Blog/Post/1382/removing-automapping-and-resetting-default-mailbox-permissions-in-exchange-online
If those mailboxes previously existed on-premises, you might need to clean up the AD attributes as well, msExchDelegateListLink in specific.
You can try using the –ClearAutoMapping flag for Remove-MailboxPermission, I've posted some examples here: https://www.michev.info/Blog/Post/1382/removing-automapping-and-resetting-default-mailbox-permissions-in-exchange-online
If those mailboxes previously existed on-premises, you might need to clean up the AD attributes as well, msExchDelegateListLink in specific.