In my configuration, Meraki dashboard 'Post URL' start with "http", not using "https", and no change at API Gateway. Here is URL/Domain examples in this case.   API Gateway URL: https://xxxxx.execute-api.ap-northeast-1.amazonaws.com/prod/cmxreceiver-dynamodb CloudFront Origin: xxxxx.execute-api.ap-northeast-1.amazonaws.com/prod CloudFront Domain: yyyyy.cloudfront.net Meraki dashboard Post URL: http://yyyyy.cloudfront.net/cmxreceiver-dynamodb   ... View more

I had same problem, and I found one workaround to use "HTTP" request to AWS API gateway. AWS API gateway is normally working only with HTTPS, so I place AWS CloudFront to use HTTP method on front side to the Meraki Cloud. Meraki Cloud > (http) > CloudFront > (https) > API Gateway/Lambda/DynamoDB   Here is configuration example of CloudFront.   Origin Setting Cache Setting ... View more