Unable to change Alias

Syed Ammar Hussaini

April 13, 2021 20:57
Updated

Issue: When you try to assign an Alias to another user or mailbox in Exchange Online via GUI or PowerShell that is currently being used as a primary email for any other user or mailbox, it gets revert to the previous one.

Reason: Make sure that the Alias you are trying to change is selected as a current primary email address of any other user, mailbox or group in question. Follow the below steps to resolve this:

1. Open the account settings from O365 Admin Center Active User section and click on Manage username and email.

2. Change email from the primary email address section:

3. click on Save Changes

It will take at least 1 hour for the changes to reflect.

Note: The above case is only for cloud-only scenario. The changes need to be done from On-Premises AD in Hybrid scenario.