Additional sign-in or account-related issues within Microsoft Teams Free
Hi, I'm John! I will help you with this.
Can you let me know if you’re using a personal Microsoft account or a Microsoft 365 business/school account?
You can check your Microsoft Teams login devices by going to the "Devices" section on the Microsoft My Account page for work/school accounts, or by checking the "Devices" list on the Microsoft account website https://account.microsoft.com/devices for personal accounts.
Click "Add comment" to let me know.
Regards,
John J.D.