In Cognito all registered users need to be confirmed before they can interact with other services.

Out-of-the-box Amazon supports confirmation by

• email
• SMS
• web UI
• lambda

To automate this process, confirming with a Lambda function is the only way to trigger the confirmation process. So I created the following lambda to confirm all created users.

exports.handler = (event, context, callback) => {
    event.response.autoConfirmUser=true;
    callback(null, event);
};

Then I used this lambda as “Pre sign-up”-trigger.

That’s about it, now all users get confirmed by the lambda function and do not need to confirm manually.