You are using UPCs, EANs, ISBNs, ASINs, or JAN codes that do not match the products you are trying to list.
This is a somewhat common error and it 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 typically isn’t with the UPCs themselves, but with the restrictions placed on the Brand. To troubleshoot if this is a Brand restriction, change the “Brand” field to something else unique and it should solve the issue. If the issue goes away, we know it was a Brand restriction. Note, you can always adjust the Brand name back and this is simply a troubleshooting technique to test if there is a restriction.
If the issue doesn’t go away after changing the Brand, please contact us answering the following questions:
1. What is the Brand name and Product Title you’re testing with?
2. Do you have Brand Registry?
3. Are you creating a variation listing or a parent item?
Once we get this information, we can assist you further.