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How to change Alias name in Office 365
I can't change alias name where appeared the message " the object is being synchronized from your on-premises organization. This action should be performed on the object in your on-premises organiza...
- If you are running a hybrid config, you need to use the set-remotemailbox with the -alias parameter with the on premises Exchange shell instead.
Set-remotemailbox -identity walid.fawzy@contoso.com -alias wfawzy
Try this https://blog.netwrix.com/2017/02/02/using-ad-to-add-an-alias-to-an-office-three-six-five-email-account/
i applied those steps but didn't work