I'm looking for some advanced tech support in setting up a Google SmartShopping Campaign. Everything has been done apart from the Dynamic Attribute linking between GA and Google Ads account. Please see screenshots attached. Google SmartShopping is displaying an error status saying that I need to add "Product ID" tag. GTM is installed on the site but I don't use it... everything goes through Google Analytics tracking at the moment. I don't recognise any of the custom labels and it's beyond my expertise at this point.
Site is built on Shopify (GA and GTM installed already). Conversion tracking has been setup too and my Standard Shopping Ads are reporting conversions etc.
Can someone help? Can give you logins etc.