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Today a user we'll call user 1 complained that since a few days or so he has to use the web app because his desktop client wont login. I go to his computer to check. The login prompt just closes itself after entering his username. I test if I can log in with my user on his computer: success. I check again if his account works: Teams just closes after entering his username. I reinstall Teams, same behavior. I delete the Teams cache folders in %AppData% plus all user credentials within the Windows Credential Manager. Nothing changed. Web app login still works fine for him.

Now comes the best part: User 1 goes to user 2's computer and logs out user 2. He then tries to log into user 2's Teams desktop client.

Same behavior. Microsoft Teams just closes after user 1 entered his username.

User 2 wants to log into his Team desktop client again.

User 2 now faces the same issue on his computer.

Microsoft Teams just closes for him.

User 1 infected user 2's workstation with this login bug.

User 1 and 2 are now forced to use the web app and are afraid to log into their teams accounts on other domain computers.


Can't say I've seen this before. Is Teams completely closing after the login box or what happens next? Is it in the systray? etc?

@Chris Webb The Teams task is completely closed.

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