I just recently got a message on Teams running on my Linux PC through PWA. "Your company has moved to the new Teams. Update now".
But after doing this, it still does not look like the New Teams I am used to on Windows.
The "New Teams" still does not have all the features from the "New Teams" I am used to on Windows
https://techcommunity.microsoft.com/t5/microsoft-teams-blog/announcing-general-availability-of-the-new-microsoft-teams-app/bc-p/4152373#M14709
I cannot add multiple Accounts. If only I could have 2 instances of this PWA-app, but that is not possible.
https://answers.microsoft.com/en-us/msteams/forum/all/when-will-teams-pwa-on-linux-allow-multiple/531c2e75-040f-44b4-b1f7-0d42c3b556c6
Sadly Microsoft Teams with this poorly support for Linux, is not (nor do I think they ever will be) a good choice for business who has a lot of developers that uses Linux.
To work around this problem on Linux, I have to use a different browser for each Microsoft Account I have. Currently I thankfully only have 2 accounts.
I installed my company Microsoft Teams on Vivaldi browser as PWA. Then I installed my customer Microsoft Teams account on Chrome browser as PWA.