Make sure that CallerReference is a random value. I recommend using a timestamp or UUIDv4. CloudFront uses the value to prevent you from accidentally resubmitting an identical request. Whenever you create a new invalidation request, you must specify a new value for CallerReference. If you make a second invalidation request with the same value for CallerReference, and if the rest of the request is the same, CloudFront doesn’t create a new invalidation request. Instead, CloudFront returns information about the invalidation request that you previously created with the same CallerReference.