Accessing Microsoft Teams using organizational or personal credentials
Dear Mola Zest,
Since the issue affects only one user, it is likely related to the local Teams application, user profile, or cached application data.
Kindly try the following steps:
Completely quit Microsoft Teams.
1> Clear Teams cache
Please refer to this article to clear Teams cache. Clear the Teams client cache - Microsoft Teams | Microsoft Learn
2> Repair Teams app
In Start Menu > Settings > Apps > Installed apps > Teams > three dots > Advanced options > Repair
If it is not available or does not help the problem, select Reset. Repair apps and programs in Windows | Microsoft Support
3> Using Teams on web.
Test Teams on the web to determine whether the issue is limited to the desktop client.
If the issue continues, update or reinstall Teams.
In addition, you should also check the Microsoft 365 Service health dashboard to rule out an active service incident. If you are an end-user, please contact your IT Admin for this step. How do I find my Microsoft 365 admin? | Microsoft Support
I hope the information shared helps point you in the right direction.