Unable to start Microsoft Teams on Windows 10

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New Contributor

I am trying to help a colleague who is unable to start Teams at all. He has uninstalled the program from Control Panel and restarted the PC. He then installs Microsoft Teams but it still will not start. Version of update.exe is 1.4.4.0. 

 

We also tried to remove any references to Teams in list of Windows Credentials for his user.

 

Is there any clean up tool to remove Microsoft Teams completely from the system in order to attempt a full and clean install? We want to avoid having to reformat the entire PC. 

2 Replies
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Apparently he had accidentally authenticated against another Office 365 Account (Work Account, AAD). We managed to remove the credential and was able to re-authenticate the application successfully. Now we can get the app going, but we are unable to launch teams.microsoft.com. It works in Firefox, but not in Internet Explorer or Edge. Trying to click the "log out" link under the "Try again" button does not work. Internet Explorer goes into a authenticate loop a couple of times and then dies with a message saying third party cookies must be Enabled. They ARE enabled. I guess with the app finally working we can ignore the browser experience.
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@Tommy Skaue 

This thread, plus another one helped me solve this for myself. In our case, one of us had an issue where Teams was working then it wasn't. For the other, the application wouldn't install. In both cases the error logs looked similar.

 

In my case, two lines in the error log helped:

 

Program: Install path C:\ProgramData\<usedID>\Microsoft\Teams already exists, 
burning it to the ground

and

 

IEnableLogger: Failed to remove existing directory on full install, is the app still running???: 
System.UnauthorizedAccessException: Access to the path 'C:\ProgramData\<userID>\Microsoft\Teams\.dead' is denied. at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)

 

I navigated to C:\ProgramData\<userID>\Microsoft\ and deleted the Teams related folders. When I ran the installer .exe again, it was successful. Somehow, the installer wasn't authenticating.

 

Our organization isn't officially supporting MS Teams, so we weren't getting any traction with solving the problem. Hope this helps someone else.