title: Azure b2c authentication using Mobile Number
body: <p>I am using Azure b2c for authenticating the user from web or mobile. By default azure b2c is asking for the email address and if multi-factor authentication is enabled, then it will ask for the phone number to verify.</p>
  
  <p>My Question is will Azure ask for either email or mobile number in the Registration? A user can give phone number and registers, then azure will have to ask for the username (may be, email id is also mandatory). Is this possible in Azure B2C or AWS?</p>