Teams app not working on a profile in MacBook Pro

You will need to search inside of the "~/Library" folder for "teams". There are multiple hits on my system. I have no idea which ones to delete. You just need to figure out what differs between the main macOS user account and the new macOS user account since one works & the other does not. Theoretically deleting the various Teams folders and any remaining .plist files with Teams in the name located in your home Library folder "~/Library" should do the trick. Hopefully the Teams app will restore the deleted folders with new default ones. There is even a chance you may have a login item configured for your main user account, but not in the new macOS user account (doesn't have to be Teams related).

Here is a couple of articles I found online that discuss reseting Teams on macOS:

https://answers.microsoft.com/en-us/msteams/forum/all/how-can-i-clear-teams-credentials-cache/b63c40d3-4aba-4389-8e9e-e7d325b00dfc

https://learn.microsoft.com/en-us/microsoftteams/troubleshoot/teams-administration/clear-teams-cache

If Teams is required by your employer, then you can try contacting your employer's IT support staff for assistance. It is possible they may be able to open a case with Microsoft in order to get to a higher level tier of support.

Sounds like you would need to delete the Teams .plist preference files located somewhere in your main home user folder's hidden Library folder "~/Library". I don't know which Teams preference files to delete or exactly where they would be located although I would first check the Preferences folder, then in the "Application Support" folder (all within hidden ~/Libary folder within your home user folder).

Just make sure Teams is not running when you delete those .plist preference files. You may need to log out afterwards & log back in so that you can be sure you have been disconnected from those old preference files.