Accessing Microsoft Teams Free using personal or organizational credentials
Hi APOORVASingh07,
I'm Nik, an independent advisor here to assist you with this.
You get this error when your phone number is associated with an existing Microsoft account as an alias.
You can check which email is associated with the number by logging in with your phone number on the MS Team mobile app then follow through with on-screen instructions.
If your phone number is already set to a Microsoft account as a primary alias then you can change the phone number or email address by these steps:
https://support.microsoft.com/nl-nl/office/de-n...
Also, you could remove your phone number from the Microsoft account;: https://support.microsoft.com/nl-nl/account-bil...
For more, see https://support.microsoft.com/nl-nl/account-bil...
Regards
Nik