Error 430 when making single graphQL request for product handles

Catalog-on-Dema
Shopify Partner
6 0 2

Below is our graphQL request. We get the 430 error even with just one request.

The x-request-id is 

0e7539f2-5fa2-43ff-953e-ad91439737fb
 
{
                    collectionByHandle(handle: \"${product_collection}\") {
                        products(first: 100 ${after}) {
                            pageInfo {
                                hasNextPage
                            }
                            edges {
                                cursor
                                node {
                                    handle
                                }
                            }
                        }
                    }
                }

The response is shown in the attached image, embedded in the Word doc. 

Thanks for your help!