[Solved] Why might a Lambda function triggered by an EventBridge rule not execute as expected? — Ans: The EventBridge rule lacks permission to invoke the Lambda function | AWS

AWS - Lambda

Why might a Lambda function triggered by an EventBridge rule not execute as expected?

AEventBridge only triggers Lambda on S3 events

BLambda functions cannot be triggered by EventBridge rules

CThe EventBridge rule lacks permission to invoke the Lambda function

DLambda functions require manual invocation only

Step-by-Step Solution

Solution:

Step 1: Understand EventBridge to Lambda permissions
EventBridge rules must have permission to invoke the Lambda function via resource-based policies.
Step 2: Eliminate incorrect statements
Lambda can be triggered by EventBridge; EventBridge triggers many event types, not just S3; Lambda supports automatic invocation.
Final Answer:
The EventBridge rule lacks permission to invoke the Lambda function -> Option C
Quick Check:
EventBridge needs invoke permission on Lambda [OK]

Quick Trick: Grant EventBridge permission to invoke Lambda to enable triggers [OK]

Common Mistakes:

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Why might a Lambda function triggered by an EventBridge rule not execute as expected?