A DevOps learn has created a Custom Lambda rule in AWS Config.

Step 1: Understanding Lambda Permissions and AWS Config

The custom AWS Config rule evaluates resources and invokes an AWS Lambda function when a compliance check is triggered. For AWS Config to invoke the Lambda function, it requires permission to do so.

Issue: The Lambda function fails to execute because AWS Config doesn ' t have permission to invoke it.

Action: Modify the resource-based policy of the Lambda function to grant AWS Config permission to invoke the Lambda function.

Why: Without this permission, AWS Config cannot trigger the Lambda function, which is why the evaluation fails.