Hi, I’m Vinay. Thanks for reaching out.
I’m here to help you today.
Once check your number correctly and try to sign in , if it is not working then try to use alternative sign in method like authenticator app or email verification.
If it still not working then create a new user account and see if it helps . For creating new user account checkout below link for process:
https://support.microsoft.com/en-us/windows/man...
I hope this resolves your issue! If you have any queries, please let me know.