Accessing Microsoft Teams using organizational or personal credentials
As of now I can confirm that with the exact same issues the only resolution is to completely wipe and re-image the devices then try to log in with account details. This appears to have fixed the issue for us so far. Ensure that you pull any windows update that you can before attempting to log into Teams Room too. It's a painful cumbersome solution but it worked for us after 9hrs+ on this issue.