Hi Ali Alshamry,
Sign out manually from Teams via your profile picture.
Clear Teams cache: Close Teams, delete contents of %appdata%\Microsoft\Teams, and restart.
Remove the old account from Microsoft Authenticator.
Clear browser cache if using Teams in a browser.
Reinstall Teams if needed.
Check for linked accounts in your Microsoft account settings.
Use InPrivate/Incognito mode in your browser to log in with the new account.
Please click Accept Answer and upvote if the above was helpful.