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Hi @Isdza
Currently the Q&A forum only supports English. In order to better help you solve your problem, please use English.
Does Teams 403 issue only occur on mobile phones? Can you log into Teams via the desktop client and web client?
If the problem only occurs on your phone, we recommend that you uninstall Teams and re-download it or check whether the network connection is normal.
If you have MS Authenticator on your phone, we recommend that you uninstall it and try to log in to Teams again.
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