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Questions about changing default domain in Office 365 tenancy
Hello, We're going to be changing domains and as such, will need to change our Office 365 tenancy default domain (i.e. from company.com to new-company.com). We are doing 100% cloud hosted Offic...
You can change the UPN using the following articles https://support.office.com/en-us/article/change-a-user-name-and-email-address-in-office-365-fb5ac074-e203-4e1f-9843-b9d1a3e03297 and https://docs.microsoft.com/en-us/powershell/module/msonline/set-msoluserprincipalname?view=azureadps-1.0
After you change the UPN the users will ask to login again using the new UPN, the time may differ depending the app, Outlook, Web, Activesync, etc.