Our store sells digital products thus we don't have a shipping fee and all our products are marked as "not a physical product" so we don't charge any shipping rate.
We use Shopify and are connected to GMC via content API but now we can't do ads because of the problem: Missing sub-attribute [country (sub-attribute of [shipping])].
Google Support told us to remove Shipping Attribute via Shopify platform and Shopify Support already told us that we don't have a shipping rate and we are at a loss on what to do. We have tried adding a shipping rate but really I don't know the next step.
Any idea on how to do this?