AWS Cognito Custom Authentication Flow: how to to trigger Post Authentication Lambda
I need help solving I need help solving I've been banging my head against this for hours... I'm reviewing some code and I'm relatively new to this, so bear with me. I'm working on implementing a custom authentication flow using AWS Cognito and Lambda. My goal is to trigger a Post Authentication Lambda function after a user successfully logs in. However, despite configuring everything correctly, the Lambda function isn't triggering. I've set up the Cognito User Pool with a custom authentication flow. Here's the relevant IAM policy for the Lambda function: ```json { "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Action": [ "lambda:InvokeFunction" ], "Resource": "arn:aws:lambda:us-west-2:123456789012:function:PostAuthFunction" } ] } ``` I also configured the User Pool to trigger this Lambda function after successful authentication, but I'm getting the following behavior in the AWS CloudWatch logs: `"User is not authorized to perform: lambda:InvokeFunction on resource: arn:aws:lambda:us-west-2:123456789012:function:PostAuthFunction"`. I've checked the function execution role and ensured that the permissions are correctly set. Additionally, I ensured that the Lambda function is in the same region as the Cognito User Pool. I even tried re-creating the User Pool and re-associating the Lambda triggers, but the scenario continues. Here's the code snippet for my Lambda function: ```javascript exports.handler = async (event) => { console.log('Post Authentication Triggered', event); // Your logic here return event; }; ``` I'm using the AWS SDK for JavaScript (v2.1021.0) for my frontend to authenticate users. I've verified that users are being authenticated successfully, but the Lambda function never runs. Can anyone guide to with this scenario or suggest further troubleshooting steps? Could someone point me to the right documentation? I'm working with Javascript in a Docker container on Ubuntu 22.04. How would you solve this? Am I missing something obvious? I'm using Javascript stable in this project. What am I doing wrong?