Add a domain to Microsoft 365 - Microsoft 365 admin
https://learn.microsoft.com/en-us/microsoft-365/admin/setup/add-domain?view=o365-worldwide
WEBSep 22, 2023 · To add an onmicrosoft.com domain: In the Microsoft 365 admin center, select Settings, and then select Domains. Select an existing .onmicrosoft.com domain. On the Overview tab, select Add onmicrosoft.com domain. On the Add onmicrosoft domain page, in the Domain name box, enter the name for your new onmicrosoft.com domain.
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