For better security of your account, you must use Two-Factor Authentication. The unique code is sent to the registered phone number. Alternatively you can use email for Two-Factor Authentication.

For better security of your account, you must use Two-Factor Authentication. Your account does not have a mobile number associated with it. A unique code will be sent to your email for authentication. After successful login, you can add your mobile number, which can be used for Two-factor authentication for future logins.