Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hi Zchen2018,
With much pleasure to reply to your post here my friend.
For your issue, please make sure the change (removing alias) in the local AD has been synced to Office 365 firstly. Also, it is recommended that you refer to Cookiekantode's reply.
@ Cookiekantode, thanks for your sharing on this case.
Regards,
Alan