Amazon flagged a duplicate ASIN or returned error 8573? We compare the products, identifiers, packaging and catalog history, then prepare the evidence for the right catalog correction or appeal.
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Last verified as of .
Founder-led enforcement expertise backed by executive leadership and specialist teams in Seller Central.
Founder, ASA Compliance Group · International speaker on Amazon enforcement and reinstatement
When your Amazon account or listings are suspended, every moment counts, and genuine expertise matters. Or Shamosh, founder of ASA Compliance Group, has spent over 10 years mastering the complexities of Amazon’s policies, compliance guidelines, and seller reinstatements. His LL.B. background informs how he reads Performance Notifications and frames compliance strategy; complex matters still run through ASA Compliance Group’s in-house legal department and outside counsel when required. He has led work across 5,500+ cases. His work spans seller account suspensions, listing appeals and compliance cases.
Or regularly shares his knowledge at seller conferences and webinars worldwide, including Prague March 2025, Sofia April 2025 and April 2026, Warsaw May 2026, with an upcoming UK appearance in October 2026. See conference appearances, explore seller webinars, read the restricted keywords guide, or see client stories in Testimonials.
AmazonSellersAppeal is operated by ASA Compliance Group, with dedicated appeal, legal, IP, and compliance teams in Seller Central. Michael Gourin and Smadar Popovski, alongside Or, lead intake and case operations; specialist staff join when your Performance Notification requires it.
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Most duplicate-ASIN files are not somebody gaming the catalog. They are ordinary catalog accidents, plus one pattern Amazon treats far more seriously. Which one you are in decides the approach.
The most common start. A manufacturer reissues a barcode, a distributor supplies a different UPC for the same unit, or a GS1 prefix changes hands. Two identifiers reach the catalog, so two records get created, and both describe the item now sitting in the warehouse.
Reconcile the GS1 record, the barcode on the package, the brand and the manufacturer product number before asking for anything. An identifier conflict resolved the wrong way merges two products that should have stayed apart.
A flat file or integration submits a product that already exists, usually because a match key was blank, mistyped, or mapped to the wrong column. Nobody decided to create a second page; the feed did it on a schedule and may still be doing it.
Two things have to be true before this closes: the redundant record is dealt with, and the feed that produced it no longer can. A correction that leaves the integration untouched gets undone by the next upload, and Amazon sees the duplicate reappear after you said it was fixed.
This is the pattern that changes the seriousness. A listing is suppressed, restricted or gated, so a second record is created for the same product to keep selling. It reads to Amazon as working around the restriction rather than as a catalog error, and the duplication is then the smaller of the two findings.
Amazon’s ASIN creation policy constrains new catalog records precisely to stop this: where the product already exists, the expectation is that you work with the existing record rather than add another one.
The same logic applies in reverse. Choosing which record survives because it holds the reviews and the sales history, rather than because it is the accurate one, is a catalog decision made for the wrong reason. State the identity case; do not argue the review case.
A different seller, a vendor, or a brand feed created the second page. Preserve the contribution history, because it explains how the records arose and the current storefront does not show it. It does not change what the catalog looks like today, and the current state is what the notice is about, but it is not set aside either: who created the record can bear on seller responsibility and on whether the right route is a correction or a dispute.
Amazon’s route here is a merge, correction or duplicate dispute supported by product evidence. What it is not is a reason to create a third record. If the brand field itself is the contested part, that is a brand misuse question and it is answered with different evidence.
Amazon’s matching flags a potential duplicate on similarity, and similarity is not identity. Two records can look nearly identical in the catalog and still be different products in the customer’s hands.
The second list is where most rejected appeals live. Every item in it is real and none of it is product identity, which is the single distinction this page exists to make.
AmazonSellersAppeal by Or Shamosh reviews your duplicate ASIN notice and evidence, then manages your case in Seller Central.
We review the notice, error code and affected ASINs to determine whether the catalog records describe the same product.
We compare identifiers, specifications and contribution history, then prepare the evidence for a correction, merge, separation or dispute.
We manage the Seller Central case, verify the resulting catalog changes and handle further evidence requests and follow-ups.
Strategy, evidence, appeal writing, submissions and unlimited follow-ups and revisions within the agreed case scope.
Amazon seller enforcement is our daily work. Amazon Sellers Appeal has handled account, listing and compliance cases across global marketplaces.
* Historical results across ASA Compliance Group-managed enforcement cases. Last verified as of .
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ASA Compliance Group operates Amazon Sellers Appeal. On duplicate-ASIN files we compare the products and the catalog history, then either prove the records are separate or run the route a true duplicate requires.
A duplicate-ASIN finding means two or more catalog records appear to represent the same commercial product. It is a statement about product identity, not about your offer. That is why closing one offer does not clear it: the offer is yours, the record is Amazon’s catalog, and the duplicate records are still there afterwards.
How the second record arrived matters for the route but not for whether there is a problem. It may have been created by hand, by a feed, by a vendor or another contributor, through a GTIN error, or deliberately to preserve reviews, ranking or selling access. The first job is to establish the authoritative product identity and the correct catalog destination, and only then to choose what to ask Amazon to do.
Three questions decide the route, in this order:
Are these the same commercial product? Brand, model, GTIN, pack count, formulation, edition, region, generation, included components.
Are these the same product at all? If they are, which record is authoritative, and do brand, identifier, category and contribution rules allow the change you want? If they are not, what proves they should remain separate?
What is live now, and what will be live after the merge, split or correction is processed?
Amazon’s product detail page rules carry the single-unique-product principle: one product, one detail page, and a materially different product needs its own record. The mirror problem is a false duplicate, where two genuinely different products are treated as one. Both are decided by the same comparison, which is why the page starts there rather than with a merge request.
Reviewers compare what the notice names against what the catalog actually shows. Most rejected responses answer a question about offers when the question was about products.
Different seller SKUs, prices, fulfilment channels or review histories are argued as proof the ASINs are different products. They describe offers, not the item in the box.
The offer comes down and the duplicate records stay up. Nothing in the catalog changed, so nothing in the finding changed either.
A merge asked for before brand, identifiers, variation structure, contribution authority and category restrictions are checked. It either bounces or collapses two products that should have stayed apart.
One duplicate is removed and a new page is created for the same product. That is the pattern Amazon reads as circumvention rather than as a catalog mistake.
Generic ASIN-creation language, or the same answer given twice, with no statement of whether the records are even the same product, and if they are, which one is authoritative and why.
A submitted flat file or an accepted processing report is described as the fix. Neither proves the live detail page changed, and the live page is what is checked.
A focused appeal connects your notice with verifiable records. Here is what we review: product identity, GTIN records, catalog matches and contribution history.
Read the exact notice and its scope. List every suspected duplicate ASIN with its seller SKU, brand, model, UPC, EAN or GTIN, pack count, category and marketplace. If the notice names error 8573, it is telling you Amazon’s matching found a close existing record at creation time, which is a different problem from a creation permission or approval block. Those belong to ASIN creation policy.
Then gather what the storefront cannot show you: creation and contribution history, Category Listings Reports, any earlier merge or split cases, flat files and their processing reports, and the variation family each record sits in. A record that looks simple today often has a history that explains the whole finding.
This is the core of the file, and it is a table rather than a paragraph. Put the records side by side and record every field as identical or different, backed by photographs of the product and packaging and by manufacturer specifications:
Then write the conclusion the comparison forces: either one authoritative record with a named canonical destination, or a specific documented difference that changes what the customer receives. A comparison that ends in neither is not finished.
Merge, split, correction and dispute are catalog-resolution routes. Offer closure is a containment step only and leaves the catalog records in place. They are not interchangeable. Merge only where the records really are one product and Amazon’s brand, identifier, category and contribution rules allow it. Separation only where the material difference is proven. Where the catalog fields are wrong but the records are not duplicates, it is an incorrect detail page correction instead.
Two cautions that decide cases. A merge can be difficult to reverse and can move review and sales history, so an incorrect merge attaches reviews to a product that never earned them. Do not request one until product identity and the permitted catalog route are established. And where the records sit inside a parent family, the merge interacts with the variation structure, which is its own enforcement lane: see variations abuse.
Four states, and they are not the same thing: prepared, uploaded, processed and live-verified. A flat file can be ready, sent, accepted row by row, and the customer facing page can still show the old values. Each state has its own evidence and they answer different questions: batch IDs, processing reports and case records show what was submitted and what Amazon did with it, and the live state is what proves the final catalog condition. Amazon checks the live state, so a complete file carries the submission trail and the live result together.
So the file closes with a fresh look at the live ASIN, offer, title, identifier and reviews, plus the Amazon case result and a current report. Say which state each item is actually in. Reporting a prepared change as a completed one is the fastest way to lose the reviewer on the next round.
If part of this does not exist, say so rather than reconstructing it. A stated gap is workable; an invented record is a second problem sitting permanently on the case log.
For sellers who already have the Performance Notification. Broader questions: full FAQ library.
Your case stays with one team for the evidence review, appeal, submissions and follow-ups.
Include each ASIN and seller SKU, the brand, GTIN and pack count, photographs of the products and packaging, and any merge, split or case history. Four short steps. Or Shamosh reads every intake.
Or Shamosh · Founder and lead strategist
5,500+ enforcement cases since 2016. Every intake is personally assessed before acceptance.
Send what you have, including prior DIY or agency appeals. We say what is viable in writing before you commit.
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Listing removed rather than duplicated: listing reinstatement. For a different notice, browse all suspension types.
