Amplify Custom Challenge never sent

I am attempting to implement a custom passwordless signup flow from the AWS Getting Started Documentation. I am nearly there, and on the last step it fails. I am unable to get Cognito to send a user an email containing a custom challenge after sign in. All other aspects of the authentication system work fine.

Here is my signin code:

    func signIn(username: String) {          Amplify.Auth.signIn(username: username, password: "bla") { [weak self] result in          switch result  {              case .success (let result):                  if case .confirmSignInWithCustomChallenge(_) = result.nextStep {                                                                 DispatchQueue.main.async {                          self?.showConfirmationSignInView()                      }                                        } else {                      print("Sign in succeeded")                  }              case .failure(let error):                  print("Sign in failed \(error)")              }          }      }                    func customChallenge(response: String) {          Amplify.Auth.confirmSignIn(challengeResponse: response) {[weak self] result in                          switch result {              case .success:                  DispatchQueue.main.async {                      self?.getCurrentAuthUser()                  }                  print("Confirm sign in succeeded")              case .failure(let error):                  print("Confirm sign in failed \(error)")              }          }      }        }  

And my lambda triggers are set up like so:

  CREATAEAUTHCHALLENGE  function createAuthChallenge(event) {      if (event.request.challengeName === 'CUSTOM_CHALLENGE') {          event.response.publicChallengeParameters = {};          event.response.privateChallengeParameters = {};          event.response.privateChallengeParameters.answer = process.env.CHALLENGEANSWER;      }  }    exports.handler = (event, context, callback) => {      createAuthChallenge(event);      callback(null, event);  };  

DEFINEAUTHCHALLENGE

exports.handler = function(event, context) {  if (event.request.session.length == 1 && event.request.session[0].challengeName == 'SRP_A') {      event.response.issueTokens = false;      event.response.failAuthentication = false;      event.response.challengeName = 'CUSTOM_CHALLENGE';  } else if (event.request.session.length == 2 && event.request.session[1].challengeName == 'CUSTOM_CHALLENGE' && event.request.session[1].challengeResult == true) {      event.response.issueTokens = true;      event.response.failAuthentication = false;      event.response.challengeName = 'CUSTOM_CHALLENGE';  } else {      event.response.issueTokens = false;      event.response.failAuthentication = true;  }      context.done(null, event);  }  

VERIFYCHALLENGE

function verifyAuthChallengeResponse(event) {      if (event.request.privateChallengeParameters.answer === event.request.challengeAnswer) {          event.response.answerCorrect = true;      } else {          event.response.answerCorrect = false;      }  }    exports.handler = (event, context, callback) => {      verifyAuthChallengeResponse(event);      callback(null, event);  };  

Though the user is able to successfully confirm sign in if I simply hardcode the challenge response, an email is never received telling the user what the custom challenge is. Any help would be appreciated!

https://stackoverflow.com/questions/66485747/amplify-custom-challenge-never-sent March 05, 2021 at 10:07AM