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Can't add alias to user as is says account is sync'd with On Premise AD, but this is not set up.

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I am trying to add alias email to all users in Exchange online management pages but i get this message:


"The operation on mailbox "Username" failed because it's out of the current user's write scope. The action 'Set-Mailbox', 'EmailAddresses', can't be performed on the object 'Username' because the object is being synchronized from your on-premises organization. This action should be performed on the object in your on-premises organization."

The problem is that i have not set up AD sync and all the users have been manually created via the management website.


Does anybody know what the issue is and how to rectify it?


Thanks in advance.

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