You have already created teams account, you are trying to log in to the linux teams application by giving credentials, unfortunately teams application says “You’re not on Teams yet, but you can set it up for your organization” .
How to fix it.
- Close linux teams application.
- Then remove the Microsoft folder from your config directory. For that you can run the following command in terminal.
rm -R ~/.config/Microsoft
- Then start linux teams application and proceed with your credentials.