title: Is SMS MFA Status in Cognito user pools set by calling setPreferredMFA or is that something else?
body: <p>when using <strong>setPreferredMFA</strong> the SMS MFA Status in Cognito user pools is disabled even if setPreferredMFA is set.</p>
  <p>What does SMS MFA Status represent and what does it do when I enable it or disable it?</p>
  <p>Thank you</p>