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Hi there, you’ve reached the user feedback site for Microsoft Teams. It’s managed by our Customer Advocacy Team inside Microsoft Teams Engineering led by Karuana Gatimu. Our entire team believes in representing your needs inside our engineering group and we appreciate the time you take to share them with us. Rest assured that a large team of dedicated people read and discuss your feedback!

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  1. Blank login window - Fix it!

    When I open the Teams app on my machine (Windows 8.1), I get a blank login window. I've tried completely uninstalling it and reinstalling it and the problem remains. My company's IT people can't figure it out either. The only way I can get it working is to close the blank login window, then it reappears, then I close it again and it says "Modern authentication failed here. Status code 4c7". Then it logs in some other way and works.

    How do I fix this?

    74 votes
    Sign in
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    62 comments  ·  Account Access (Sign-In)  ·  Flag idea as inappropriate…  ·  Admin →

    This is expected behavior when an organization’s SSO doesn’t have Modern Auth enabled correctly with fallback auth. For more details around the 4c7 error and sign-in issues, please see the following articles:

    https://support.microsoft.com/help/4041047/modern-authentication-fails-in-teams-status-code-4c7

    https://support.microsoft.com/office/why-am-i-having-trouble-signing-in-to-microsoft-teams-a02f683b-61a3-4008-9447-ee60c5593b0f

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