This article will show you how to update a Microsoft 365 user account (formerly Office 365), allowing you to change the username, domain name and other settings.
Step 2 of 3
From there, select Modify for the package you want to upgrade.
Step 3 of 3
On the pop-up window that appears, select the domain you wish to switch to from the drop-down menu below Domain. Feel free to change any other details as well.
Once done, click Modify user to confirm your choice.