How to Solve The Microsoft Teams Unknown User Error

Get to identify all users on your Team

4 min. read

Published onApril 22, 2024

published onApril 22, 2024

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For the sake of data integrity and preventing unauthorized users in Microsft Teams, an unknown user appearing in the admin centre poses a risk and should be dealt with immediately.

An unknown user may appear among the list if you’ve recently made changes likeremoving an old user, the user has been inactive for a while and is now being re-added. There could also be delays in synchronization. Some changes made on Azure can take up to 24 hours to reflect.

How do I fix unknown users in Microsoft Teams?

1. Clear Teams cache

While at it, also ensure you’re using an up-to-date Microsoft Teams or try the web version. And if you’re using Teams on a browser, clear your browser cache and cookies too and see if the error disappears.

2. Change Active Azure Directory settings

3. Reconfigure Coexistence Mode

In teams, during transition, some admins may use the Islands mode to allow users to use both Skype and Teams simultaneously. While this is beneficial especially when there is information on both platforms, juggling two modes can result in compatibility issues and hence lead to the unknown user error.

Switching to Teams only allows all users to be on the same platform. However, if you’re yet to complete the transition, this would not be an option.

4. Check and reconfigure permissions

5. Remove Microsoft Account Credentials

6. Reinstall Teams

Unfortunately, the unknown user issue may take time to be resolved so in the meantime, you can rely on theMicrosoft Teams chat monitoring featurejust to make sure the unknown user is not an unauthorized party accessing sensitive information.

Sometimes it’s all about synchronization that takes time to reflect across Microsoft apps. For instance, yourprofile picture on Teams may delay in appearingbut eventually, it all works out.

Some aspects may require troubleshooting but in terms of preparation for your Teams meetings, you can stay ahead by downloading thenetwork assessment toolto ensure connection issues are never a problem.

Have you encountered this error before? What solution fixed it for you? Let us know in the comment section.

How to Solve The Microsoft Teams Unknown User Error#

How do I fix unknown users in Microsoft Teams?#

1. Clear Teams cache#

2. Change Active Azure Directory settings#

3. Reconfigure Coexistence Mode#

4. Check and reconfigure permissions#

5. Remove Microsoft Account Credentials#

6. Reinstall Teams#