Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello @Ranganath,
Based on what you explained, your email address is still connected to the Microsoft 365 account of the company you worked with before. Even though your project ended in 2021, your account was never removed from their system. That’s why you are having trouble signing in to Teams.
Since that company manages the Microsoft 365 setup and controls the domain, the domain is under their control, you will not be able to keep using it in your own Microsoft 365 setup unless your company takes ownership and manages it separately.
To provide the best recommendation, could you try to use Teams on web and provide me some screenshots about your issue?
If you have any concern or you would like to change your email address, please feel free to let me know.