“You are using UPCs, EANs, ISBNs, ASINs, or JAN codes that do not match the products you are trying to list.”

This error typically happens on Amazon if you’re listing a Brand that already has UPCs and Amazon is restricting the Brand from adding more UPCs (to prevent duplicate listings).  The issue isn’t with the UPCs themselves, but with the restrictions placed on the Brand.  To fix this, please first use non-variants to upload the list in the Amazon backend to troubleshoot the problem. You can refer to the following matters.