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Meghana-MSFT 

I'm using the below Lambda function to connect the WebHook to an AWS SNS(Simple Notification Service) topic, Is it the issue with this lambda function? can you try to reproduce the scenario from your end?

import urllib3
import json

http = urllib3.PoolManager()


def lambda_handler(event, context):
    url = "YOUR WEBHOOK URL"
    msg = {"text": event["Records"][0]["Sns"]["Message"]}
    encoded_msg = json.dumps(msg).encode("utf-8")
    resp = http.request("POST", url, body=encoded_msg)
    print(
        {
            "message": event["Records"][0]["Sns"]["Message"],
            "status_code": resp.status,
            "response": resp.data,
        }
    )