amazon web services - UserLambdaValidationException: PostAuthentication (AWS Cogntio) -


i have aws cognito userpool.

user provides: email , password

verification code sent email address

user signed in userpool - works fine.

then, sign in user breaks following error:

userlambdavalidationexception: postauthentication failed error request id: xxxxx. process exited before completing request.

after looking noted dev guid:

userlambdavalidationexception exception thrown when amazon cognito service encounters user validation exception aws lambda service. http status code: 400

any 1 encountered before - looks internal error?

turns out error related setup userpool.

you have allow users sign in email address username.

http://docs.aws.amazon.com/cognito/latest/developerguide/user-pool-settings-attributes.html#user-pool-settings-aliases-settings-option-2


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