Hi @IBN ,
Please note this:
Do Teams meetings migrate cross-tenant?
The meetings will move, however the Teams meeting URL does not update when items migrate cross-tenant. Since the URL will be invalid in the target tenant you will need to remove and recreate the Teams meetings.
Use EXRCA to test the Teams meeting tab and see if that could work as usual:
https://testconnectivity.microsoft.com/tests/teams
And for your issue, please try re-logging in to the Teams account and if that doesn't work, please delete the Teams contents from your local computer.
Also the Teams for web is a good idea for you to try.
Best regards,
Lou
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