You can use the Set-MsolUserPrincipalName cmdlet in the Azure Active Directory PowerShell module (click to learn how to install) to change the User Principal Name (UPN) of a user in the Azure Active Directory (AAD). The UPN is the name that identifies a user in an Active Directory environment and is typically in the format of an email address (e.g. user@example.com).
For example, if you want to change the UPN of a user from user@example.com to newuser@example.com, you will run the following command:
Set-MsolUserPrincipalName -UserPrincipalName user@example.com -NewUserPrincipalName newuser@example.com
You must have the necessary permissions in AAD to run this command.
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