FIX: Microsoft Teams error login hint is duplicated

Teodor Nechita
by Teodor Nechita
Software Managing Editor
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  • Microsoft Teams is Office 365's portal for communication and collaboration
  • The platform helps millions of users worldwide to connect to their digital open space offices
  • But nobody wants to see login error codes, especially when there's an important Microsoft Teams meeting scheduled to begin shortly. Worry not, use this guide to fix the problem
  • Visit our Microsoft Teams Hub for additional guides, as well as tips and tricks that will help you become a Teams expert
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When it comes to corporate work, collaborative tools are held in high regard since they help everyone stay in touch. One very good example is Microsoft Teams, a neat and completely free collaborative tool that is also part of the Microsoft Office Suite but can also be downloaded separately.

Users log into it, and from then on they can start communicating with colleagues, send files, and more.

Unfortunately, Microsoft Teams has the occasional glitch in the system, especially when it comes to login issues. For example, users have been reporting that they are receiving an error message when trying to enter Teams:

I am struggling to connect to Teams today. The error switches between a 500 error or this: “AADSTS9000411: The request is not properly formatted. The parameter ‘login_hint’ is duplicated”. I have tried clearing my Credentials in the cred manager and restarted both my PC and the Teams app. Any suggestions?

This issue is quite common, and that is why we decided to approach it with this step-by-step guide on how to fix it.

How do I fix the duplicated login hint error?

1. Clean your Windows PC of all Teams login credentials and cache files

  1. Exit Microsoft Team
  2. Press Windows + R
  3. In the search box, search the folder location and click OK to navigate to that location:
    • %appdata%\Microsoft\teams
  4. Delete the items under:
    • C:\Users\UserName\AppData\Roaming\Microsoftteams\Cache
  5. Delete all the items under the folder:
    • C:\Users\UserName\AppData\Roaming\Microsoft\Teams\Application Cache\Cache
  6. Restart Teams

2. Perform a clean reinstall

  1. Press Start
  2. Press Settings
  3. Select Apps
  4. Search for Microsoft Teams in the list of installed programs
  5. Uninstall the following two programs:
    • Microsoft Teams
    • Teams Machine-Wide Installeruninstall microsoft teams
  6. Once the uninstall is finished, delete all files from the following locations:
    • %LocalAppData%\Microsoft\Teams
    • %LocalAppData%\Microsoft\TeamsMeetingsAddin
    • %AppData%\Microsoft\Teams
    • %LocalAppData%\SquirrelTemp
  7. Go to Microsoft’s Team’s website, download the client, and install it again
  8. Reboot your PC

Tired of Microsoft Teams? Check out this article for some great alternatives.

3. Enlarge Microsoft Teams and try againteams signing out

  1. Launch Microsoft Teams
  2. Close the window with the error message
  3. Enlarge the Teams window and click on the Signing out link
  4. Login to Teams

Note: This method is more of a bizarre workaround, but it has proven itself useful to quite a number of users.

4. Use the web appteams web client

This issue very common when using the Microsoft Teams desktop app. As such, if you encounter the duplicated login hint error, try using the Microsoft Teams web client instead.

By following any of these methods, you should be able to log into Microsoft Teams without encountering the login hint is duplicated error.

Which one of these methods worked best for you? Leave us a message in the comments section below.

FAQ: Learn more about Microsoft Teams

  • Why can’t I sign in to Microsoft Teams after multiple attempts?

If you check your Internet connection and made sure you’re using the right credentials but you still can’t log in to Teams, there might be something wrong with your domain or Office 365 account. Escalade the problem to your IT admin or sysadmin.

  • How do I fix Microsoft Teams log in error codes?

If your login attempts to Microsoft Teams failed with particular error codes, follow the instructions listed in our troubleshooting guide on how to fix common Teams sign-in errors.

  • How can I fix  Microsoft Teams blank login window?

In most cases, if you’re getting a blank login window on Microsoft Teams, your date and time settings are not correct. Set the correct date and time first, then restart your computer, launch Teams and you should now be able to log in.

Editor’s Note: This post was originally published in February 2020 and has since been updated for freshness and accuracy.