MS Teams unknown User @invalid.teams.ms

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This is an know bug within Teams.

This issue is happening on desktop and mobile version only, if you had installed the Teams app before and changed / created a new Microsoft M365 Tenant with the same user name (UPN/ SIP)

Solution:

  1. Uninstall Teams App
  2. Delete all Teams references and folders
  3. Reinstall Teams App
  4. Login normally


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