I've been getting this error. Reboot and app restart does not fix the issue.
We've run into an issue
Oops, something went wrong
Sometimes later in the day, it'll work. Sometimes, it does not. I just use the web version.
Why can't Microsoft figure out how to log into their own application on their own operating system?
https://douglastclee.blogspot.com/2024/08/buggish-ms-teams-unable-to-login-device_30.html
https://douglastclee.blogspot.com/2024/08/buggish-ms-teams-unable-to-login-device.html
https://douglastclee.blogspot.com/2024/07/buggish-ms-teams-login-again.html
https://douglastclee.blogspot.com/2024/07/buggish-ms-teams-login-issue.html
Update 2024-12-09
Buggish: MS Teams Unable to Login. We've run into an issue. Oops, something went wrong! (Part 3) With Workaround
https://douglastclee.blogspot.com/2024/12/buggish-ms-teams-unable-to-login-weve.html