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DaGbyte's avatar
DaGbyte
Copper Contributor
Oct 09, 2020

Change Teams default login

I work for a company that has recently been acquired by another company. Both companies have O365 tenants and we are working to move some services to the new company. The problem I have is that my Teams account is in a tenant other than the one associated with my Windows AD logon.

 

I logon to my machine in Company A - user@CompanyA.com. My Teams account is in Company B - user@CompanyB.com. We have disabled the O365 features in Company A and now use everything in the Company B tenant. There is no trust between the domains, but we can access resources in the other domain using the proper credentials. All office 365 features work perfectly in Company B, except for teams.

 

Every time I launch Teams, it wants to logon to Company A. How can I change Teams to logon into Company B instead? I was told by a previous MVP that it is not possible. I'm hoping he is wrong 😉

  • DaGbyte Hi David, would it be an alternative to prevent the automatic population of the UPN? If applicable you can use this reg key.

     

    Turn off pre-population of the UPN:

    Computer\HKEY_CURRENT_USER\Software\Microsoft\Office\Teams
    SkipUpnPrefill (REG_DWORD)
    0x00000001 (1)

  • M___S's avatar
    M___S
    Copper Contributor
    I was finally able to log on with a different (pre-existing) account than the one that somehow got defined on a new laptop by unchecking, in the settings, "Auto-start application."
  • gericht's avatar
    gericht
    Copper Contributor

    DaGbyte I do face that problem running linux teams.
    every time I start up Teams it asks me if it should change to a Guest account with an external organization I had been invited to some time ago, and which I have to use occasionally.
    since a few weeks (after I had to interact by this guest account more frequently) this inconvenience popped up.
    and I wonder - how to get rid of it?

  • DaGbyte Hi David, would it be an alternative to prevent the automatic population of the UPN? If applicable you can use this reg key.

     

    Turn off pre-population of the UPN:

    Computer\HKEY_CURRENT_USER\Software\Microsoft\Office\Teams
    SkipUpnPrefill (REG_DWORD)
    0x00000001 (1)

  • Andrew Hodges's avatar
    Andrew Hodges
    Bronze Contributor

    DaGbyte 

     

    This is launching the desktop client? You have Single Sign on setup?

     

    What happens when you sign out in the Teams client and login with the other account then restart the computer?  

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