I'm on a Chromebook, running Chrome.
I only have two Microsoft tabs open, one for Outlook, one for Teams. Other non-MS tabs are open.
I've been running this way for a while.
I've never been able to open the Teams tab first, or, after an appropriate idle time, like overnight, the Outlook tab says I need to log in again, and I can't.
The solution has been to open the Outlook tab, log in, and use the waffle button ctrl-Teams to open Teams in a new tab.
Today, that doesn't work.
Outlook opens, asks for a login, challenges with the Two-Factor SMS, and brings up Outlook.
Opening the new tab to Teams doesn't work. I can't open it in an Incognito tab, either.
The message on screen is "To re-enable the application the tab needs to be refreshed." and a button that says "I'm back". Tapping the button, refreshing, clearing cache, nothing makes a difference.
I have Teams open on my Android phone, but I can't get it to open on the web on Chromebook.
(On Android, the Chrome browser isn't supported. It says I need to use the app.)