challenge method
Initiates a challenge for the authenticator identified by
authenticatorId (obtained from getAuthenticators).
For out-of-band factors (SMS, Email, Push) this triggers delivery of the
code and returns an MfaChallenge whose oobCode you pass to
verifyOob. For TOTP, verify directly with verifyOtp.
Implementation
Future<MfaChallenge> challenge({required final String authenticatorId}) =>
Auth0FlutterWebPlatform.instance
.mfaChallenge(_mfaToken, authenticatorId);