Google shopping not recognizing EAN

Dear support,

I noticed syncing my products to Google Merchant gives the following fix suggestion for all products:

I’m wondering what I’m doing wrong because all the products in WooCommerce now have EAN13 codes. I must mention that these EAN13 codes are self-purchased and unique. I am also using the Google Listing & Ads plugin inside WordPress. The EAN codes are viewable on the product page, but my preference is to disable this in the future so they become not viewable on the product page. Am I forgetting something? Thank you!