Sep 03 2021 09:53 AM
Sep 04 2021 01:49 AM - edited Sep 04 2021 02:02 AM
Copy this script and paste it in PowerShell and hit enter https://docs.microsoft.com/en-us/microsoftteams/scripts/powershell-script-teams-reset-autostart
As for Teams on the web you should be good if simply clearing all the browsing data, or as an alternative use InPrivate mode / Incognito.
Btw, verify if the old account is here as well Add or remove accounts on your PC (microsoft.com)