You will need to add/verify your domain first: https://learn.microsoft.com/en-us/microsoft-365/admin/setup/add-domain?view=o365-worldwide
Once added, make sure to complete the wizard thingy to configure it for whichever services you want to use within O365, particularly Exchange Online and the corresponding DNS entries. After a domain is verified, you can use the M365 Admin Center to add/changed email addresses as needed.
how can I change from an onmicrosoft email address?
Kostis
21
Reputation points
When I was setting up my business account, I was required to set up an email address that was XXX@[Company Name].onmicrosoft.com
How can I remove the onmicrosoft part and keep my proper business email address?
Exchange | Exchange Server | Management
7,925 questions
Accepted answer
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Vasil Michev 119.7K Reputation points MVP Volunteer Moderator
2021-01-15T11:16:10.507+00:00