Hi @Chris Kottaridis ,
However if while in Chrome I click on use "use browser" it gets me in.
Not sure why the app has a problem.
But I have something workable now.
Thanks for sharing the update and great to know that you can now get it work by accessing https://teams.live.com from the supported browser. So it finally turns out that you are indeed using a personal account which is currently not supported on Teams Linux client. (See the discussion in this thread for more information. )
With the above being said, I'd recommend just visiting https://teams.live.com from the browser as you did above when you need to access Teams from the Linux host. Meanwhile, I searched a lot and found a feature request has already been submitted to the dedicated feedback portal for Microsoft Teams. I've added my vote for it and I'll leave the link below so that you or others who read this thread can also help add votes or comments there. Hopefully we can see this realized in the near future:
Enable using personal accounts in the linux client.
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