Hello,
I have a question to this problem. I did as you proposed and the products are listed on Google Merchant Center and they are active. But its says on my Shopify Backend that the majority of my products are not active and that I should add GTIN’s to each product.
Our shop is in Germany and we use EAN-codes here and I add them to each product but Shopify doesn’t accept it. Is there a bug on Shopify because on Google Merchant Center they are active?
Kind regards,