Microsoft Teams issue login on existing account

Question

Hello,

I have a user who is currently facing an issue with Microsoft Teams login on existing account.

The user account does not exist in tenant 'Microsoft Services' and cannot access the application in that tenant.

The account will need to be added as an external user in the tenant first. Then Sign out and sign in again with a different Azure Active Directory user account.

Does anyone have any idea how to resolve this issue.

Answer 1

Hi @IBN

It seems that the error message is a Azure AD login error. This article give a explanation of the issue:
http://www.agilepointnxblog.com/windows-azure-active-directory-login-error-aadsts50020/.

It recommends you delete your Teams client cache as the following steps:

1. Fully exit the Microsoft Teams desktop client. To do this, either right click Teams from the Icon Tray and select ‘Quit’. Or run Task Manager and fully kill the process.
2. Go to File Explorer, and type in %appdata%\Microsoft\teams.
3. Once in the directory, delete any file in the following folders:
   %appdata%\Microsoft\teams\application cache\cache
   %appdata%\Microsoft\teams\blob_storage
   %appdata%\Microsoft\teams\Cache
   %appdata%\Microsoft\teams\databases
   %appdata%\Microsoft\teams\GPUcache
   %appdata%\Microsoft\teams\IndexedDB
   %appdata%\Microsoft\teams\Local Storage
   %appdata%\Microsoft\teams\tmp

If it is no luck after that, you could uninstall and reinstall the Microsoft Teams client and have a try.

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