Just an update in case any is encountering this same issue - wasn't able to figure out why the Storefront client and native fetch was erroring, or the GraphiQL issue. But, was able to get a successful response using XMLHttpRequest 

I'm trying to use the storefront API client to query metaobjects in our store. So far I have not been able to get a successful response from the Shopify GraphiQL app or from our client-side JS. But, when I test the request from Insomnia app it's succ...