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66304432 asked JimmyYang-MSFT answered

Microsoft Teams issue login on existing account

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.

office-teams-windows-itprooffice-teams-linux-itpro
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@66304432 - Looks like your question is not related to Microsoft Teams app development related.

We are mainly responsible for Microsoft Teams app development related issues.
For Microsoft Teams product issues/failures your tenant Admin can reach out to Microsoft 365 Product Support.
For general questions about Microsoft Teams please post your question on Microsoft Teams Community.

Could you please help us to remove tag/label as "office-teams-app-dev"


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1 Answer

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JimmyYang-MSFT answered

Hi @66304432

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.

Note: Microsoft is providing this information as a convenience to you. The sites are not controlled by Microsoft. Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please make sure that you completely understand the risk before retrieving any suggestions from the above link.


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