Changing UPN, what risks to expect?

Leo Johnson 151 Reputation points
2021-06-10T13:26:44.04+00:00

Hi y'all,

So one our sister companies asked us to correct their UPN in the local Active Directory, so they could login in to Teams with the correct UPN.

This is totally new for me, so what could I expect?

What are the risks when changing a UPN?

They only use Teams in Office 365, no other services.

They are using a local Exchange server for mail.
They do not know if they log anywhere else in with the UPN.

Please help me to identify the risks, the do's & don'ts for changing the UPN.

Thanks!

Leo Johnson

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  1. Andy David - MVP 141.5K Reputation points MVP
    2021-06-10T13:31:04.01+00:00

    The biggest concern is probably OneDrive:
    https://learn.microsoft.com/en-us/onedrive/upn-changes

    ALso see:
    https://learn.microsoft.com/en-us/azure/active-directory/hybrid/howto-troubleshoot-upn-changes

    Otherwise, its pretty straight forward, just be ready to help people logon and/or access Teams...

    1 person found this answer helpful.

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  1. Fan Fan 15,291 Reputation points Microsoft Vendor
    2021-06-11T00:44:35.977+00:00

    Hi,

    Based on my understanding, you want to change the UPN of users to match their accounts for mail or teams, right?

    This situation happens for many companies.
    Based on my test, this only changes the user logon name on on-premise AD.
    But not sure if there are any Apps that rely on user's UPN.
    It will be a better option to change the UPN of a user for test.

    Following link for your reference:
    https://www.petenetlive.com/KB/Article/0001238

    This response contains a third-party link. We provide this link for easy reference. Microsoft cannot guarantee the validity of any information and content in this link.

    Bast Regards,