AWS Step Functions scenarios with 'Task scenarios' scenarios Despite Valid Lambda Function and Permissions
I'm trying to implement I'm prototyping a solution and I've searched everywhere and can't find a clear answer..... I am using AWS Step Functions to orchestrate a workflow that includes several Lambda functions. One of the steps in my state machine calls a Lambda function that processes images and uploads them to S3. The state machine enters a failed state with the behavior message 'Task Failed' when it tries to invoke this Lambda function, even though I can invoke the function directly from the AWS console without any issues. Here's a simplified version of my state machine definition: ```json { "Comment": "A simple AWS Step Functions state machine that processes images.", "StartAt": "ImageProcessing", "States": { "ImageProcessing": { "Type": "Task", "Resource": "arn:aws:lambda:us-west-2:123456789012:function:ProcessImage", "ResultPath": "$.result", "Next": "UploadToS3" }, "UploadToS3": { "Type": "Task", "Resource": "arn:aws:lambda:us-west-2:123456789012:function:UploadImageToS3", "End": true } } } ``` In my Lambda function, I am using the AWS SDK for JavaScript (v3) to handle the image processing and S3 uploads. The IAM role associated with my Step Function has the following policy attached, allowing invocation of the Lambda function and S3 access: ```json { "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Action": ["lambda:InvokeFunction"], "Resource": "arn:aws:lambda:us-west-2:123456789012:function:ProcessImage" }, { "Effect": "Allow", "Action": ["s3:PutObject"], "Resource": "arn:aws:s3:::my-bucket/*" } ] } ``` I have confirmed that the Lambda function's execution role has the necessary permissions for both processing images and uploading to S3. However, I still get the 'Task Failed' behavior when the Step Function tries to call the Lambda function. I also added logging to the Lambda function, which shows that it does not even receive the invocation from the Step Function. I verified that the input being passed to the state machine is valid. I suspect that there may be some configuration scenario or a missing permission, but I want to figure it out. Any insights on what might be going wrong or steps I can take to troubleshoot this scenario further? I'm working on a application that needs to handle this. What am I doing wrong? I'm using Javascript latest in this project. Any suggestions would be helpful.