I have a very simple nodejs based AWS Lambda function which has an event variable that I am trying to pass through slack/AWS Cli while invoking the function on Mac OS. Below is the code

exports.handler = async (event) => {
const a = event["domain"];
    return a;
};

On testing function in AWS Lambda console if I provide set it up in below way it works fine.

It works fine and shows the result as expected. But when I am trying to run it using AWS Cli or Slack(ChatOps) it is not passing the event data. Below is the lambda invokation command I am using,

@aws lambda invoke --invocation-type RequestResponse --function-name manrill-test 
--region us-east-1 --payload "{ \"domain\": \"xyz.com\" }"

This shows the below message and looks like the payload/ event data is not being passed properly.

ExecutedVersion: $LATEST
StatusCode: 200
Payload:
null

Any idea what I am doing wrong? Ideally it should show the value of event data which I am passing (xyz.com).