[Solved] An AWS SNS subscription to a Lambda function is not triggering the function. The subscription code is:sns.subscribe({ Protocol: 'lambda', Endpoint:... | AWS

AWS - SNS and SQS

An AWS SNS subscription to a Lambda function is not triggering the function. The subscription code is:

sns.subscribe({ Protocol: 'lambda', Endpoint: 'arn:aws:lambda:region:account-id:function:myFunction' });

What is a possible cause?

ALambda function policy does not allow SNS invocation

BProtocol 'lambda' is not supported

CEndpoint ARN is incorrect format for Lambda

DSNS topics cannot trigger Lambda functions

Step-by-Step Solution

Solution:

Step 1: Verify Lambda permissions for SNS
Lambda functions must have a resource policy allowing SNS to invoke them.
Step 2: Identify missing permission as cause
If the policy is missing or incorrect, SNS cannot trigger the Lambda function despite correct subscription.
Final Answer:
Lambda function policy does not allow SNS invocation -> Option A
Quick Check:
Lambda needs invoke permission from SNS [OK]

Quick Trick: Add SNS invoke permission to Lambda policy to enable triggers [OK]

Common Mistakes:

MISTAKES

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An AWS SNS subscription to a Lambda function is not triggering the function. The subscription code is: