Hello everyone,

I’m hoping someone here might have advice or has gone through a similar experience.

I’m trying to list a new branded product on Amazon. I’ve purchased official UPC codes directly through GS1, and GS1 has confirmed that everything is set up correctly on their end. When I run a UPC lookup, the codes return accurate company and brand information.

However, when I try to list the product on Amazon, I receive this error: The SKU does not match any ASIN and contains invalid value(s) for attributes required for creation of a new ASIN. I’ve already contacted Amazon Seller Support several times, but I continue to receive the same generic response, with no real resolution. The UPCs are already printed on my product packaging.

Here's a quick overview of what I’ve done so far:

Verified the UPCs with GS1 — they are valid and correctly linked to my brand.

Attempted to create the listing through both the regular interface and flat file upload.

Reached out to Seller Support, but haven’t received any clear explanation or solution.

My suspicion is that Amazon may not be properly linking the GS1 prefix to my brand name, or that their system doesn't yet recognize the UPC as part of an existing catalog product. If anyone has faced this issue or knows a workaround — especially for GS1 UPCs and branded items — I would sincerely appreciate your insights.

Thank you in advance for your help and time!