enrollEmail method
Enrolls a new email factor for the given email address.
Returns an MfaEnrollmentChallenge containing the oobCode used to
complete verification via verifyOob once the user receives the code.
Implementation
Future<MfaEnrollmentChallenge> enrollEmail({required final String email}) =>
Auth0FlutterWebPlatform.instance.mfaEnrollEmail(_mfaToken, email);