title: Azure b2c mfa with SMS only when signup not sign in
body: <p>I have set up with the default signin and signup flow. I have also enabled mfa. </p>
  
  <p>This works fine. Is it possible to configure the mfa only for signup and not for sign in?</p>
  
  <p>The mfa is only needed for password change or to access certain pages in the app.</p>
  
  <p>regards
  Stefan</p>