Unable to verify secret hash for client in Amazon Cognito Userpools

It seems that currently AWS Cognito doesn't handle client secret perfectly. It will work in the near future but as for now it is still a beta version.

For me it is working fine for an app without a client secret but fails for an app with a client secret.

So in your user pool try to create a new app without generating a client secret. Then use that app to signup a new user or to confirm registration.

According to the Docs: http://docs.aws.amazon.com/cognito/latest/developerguide/setting-up-the-javascript-sdk.html

The Javascript SDK doesn't support Apps with a Client Secret.

The instructions now state that you need to uncheck the "Generate Client Secret" when creating the app for the User Pool.