Hello Redolfi,
Thanks for posting the query here in this forum.
I’m sorry to hear that you’re having trouble logging into Teams.
The error might indicate that there is something wrong on the admin setup side of things. It can be resolved if the admin changes the MDM user scope and MAM user scope to "None."
However, here are a few things you can try to troubleshoot the problem.
Add the account to your device.
Go to settings on your device. click on accounts on the left pane, then select access work or school. locate the account you’re trying to log in using, then disconnect it. wait for a few moments, then add the account again.
Clear your Teams credentials and cache on your device:
Type credential manager in the search box on the taskbar > Select Windows Credentials
Select the expand button of the MS Teams section: msteams_adalsso/adal_context_segments.
Click on the Remove button.
Follow the steps in the article to clear the cache: https://learn.microsoft.com/microsoftteams/troubleshoot/teams-administration/clear-teams-cache
Please see the troubleshooting steps in this video. https://www.youtube.com/watch?v=onMKkhOBoGs
'Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.'
However, if the issue persists, please reattach the error image, as the attached image not showing.
I hope this helps! Let me know if you have any questions.
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Best regards, Oluwatosin.