A single-use code is a verification code Microsoft sends to your registered email ID or phone number to confirm that you are the legitimate owner of the Microsoft account.

If Microsoft Store App is not sending verification codes, try using the web version of Microsoft Store app and execute the solutions mentioned here.

Two-factor authentication (2FA) protects your Microsoft account. It's also a reason most people get locked out. It adds an extra layer of security through an authenticator app, SMS code, or email ...