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Need assistance changing a user email address from ALL CAPS to lowercase.
Hello, I have recently been put in charge of my company's new online Office365 environment. One of my first tasks was to fix a users email address capitalization. For some reason when their use...
That's the UPN value, you can update it from the M365 Admin center or via PowerShell:
Set-MsolUserPrincipalName -UserPrincipalName user@domain.com -NewUserPrincipalName new@domain.com
Set-MsolUserPrincipalName -UserPrincipalName user@domain.com -NewUserPrincipalName new@domain.com