Error 18137 — Listing has been auto-matched to an existing ASIN

Amazon's matching algorithm linked your submission to an existing ASIN. This is informational — your listing is live under that ASIN; you can verify or dispute the match.

When you submit a product without an ASIN, Amazon attempts to match by GTIN, title, brand, and other attributes. A successful match attaches your offer to the existing detail page.

1. Verify the matched ASIN is correct — open it in Amazon and confirm it's the same product.
2. If correct, no action needed. Your listing is live.
3. If incorrectly matched, file a Catalog Dispute or use Seller Central → Manage Inventory → Edit → Suggested ASIN to specify the correct one.
4. For brand owners: review your matches periodically; mismatches dilute your catalog quality.

• Assuming an auto-match is always wrong — it's usually correct; verify before disputing
• Disputes for incorrect matches take 3-7 days; preventing the match by submitting your own correct ASIN is faster