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We are using aws-appsync using cognito in backend. By default it takes username, password, email fields for sign-in / signup process. So we have only phone number to signing/signup not username and password. So for that in backend they kept the custom authentication option so we can pass custom keys instead of username and password.

Now I have used the following function for that:

AWS.config.region = '****';
 AWS.config.credentials = new AWS.CognitoIdentityCredentials(
 IdentityPoolId: '*******'
 );
 AWS.config.credentials.get(function(err) 
 if (err) alert(JSON.stringify(err));
 else alert(AWS.config.credentials);
 );

 var cognitoidentityserviceprovider = new 
 AWS.CognitoIdentityServiceProvider();
 var params = 
 AuthFlow : 'CUSTOM_AUTH',
 ClientId: '******',
 AuthParameters: 
 USERNAME: '+91********'
 
 
 cognitoidentityserviceprovider.initiateAuth(params, function(err, data)
 if(err)
 alert(JSON.stringify(err))
 else
 alert(JSON.stringify(data))
 
 )

So here when the user does not exist then its showing user does not exist error
when given the phone number that is present it showing an error like unrecognised lambda output.

So, Here the two questions like

1. If I get user does not exist, then how to create that user.


2. How to solve this unrecognised lambda output error. (Code: Invalid lambda codeexception)