How to handle unauthorized seller on a brand listing on Amazon UK

An unauthorized seller appears on a brand listing and, within hours, the buy box shifts, review velocity drops, and the brand owner's revenue takes a direct hit. The damage is not theoretical. Inventory already in FBA, a promotional calendar already set, a PPC campaign already running – all of it is disrupted the moment a third party joins the listing without the brand's authorization. The question sellers and brand owners bring to us is not whether to act, but exactly how, and in what order.

TL;DRAn unauthorized seller on an Amazon UK brand listing is a third party offering the same ASIN without the brand owner's consent, which may breach trademark rights, the Amazon Business Solutions Agreement, or both. Resolving it requires identifying the type of infringement, filing the correct complaint type through Brand Registry or Seller Central, and – where the complaint is rejected or the seller returns – escalating through Amazon's own tools or, where appropriate, through legal channels. The path and timeline depend on whether the products are counterfeit, gray-market, or genuinely the brand's goods sold by an unauthorized reseller.

This guide walks through the full step sequence for Amazon UK: how to correctly identify what you are dealing with, which complaint route matches the situation, where filings typically go wrong, and what to do when Amazon's first response is not removal. We also cover the seller's perspective – because a complaint from a brand owner does not automatically mean the seller on the listing did something wrong.

What does "unauthorized seller" actually mean on Amazon UK?

The term covers at least three legally distinct situations, and the correct remedy is different for each.

First, there are counterfeit sellers – third parties listing products that are not genuine, using the brand's trademark to divert the brand's customers. This is the clearest trademark infringement case and the situation Amazon's enforcement tools are most readily deployed against. A rights owner can file a trademark infringement complaint through Brand Registry, and Amazon will generally act if the evidence is clear.

Second, there are unauthorized resellers of genuine goods – sellers who obtained authentic product through some channel (liquidation, parallel import, a distributor who violated their contract) and are now on the listing. This is what trade practitioners call the gray-market problem. The goods may be physically identical to the brand's own stock, but the brand owner never authorized the sale on this channel. Trademark law in the UK and EU has a doctrine of exhaustion – broadly, that once a genuine product is put on the market in the UK or the EEA by or with the consent of the trademark owner, the trademark right is exhausted and the reseller can trade it. This makes the pure trademark complaint far weaker for genuine goods. The route here is often contractual (did the reseller violate a distribution agreement?) or policy-based (Amazon's own policies on authorized resellers, where these apply).

Third, there are sellers who are technically authorized but have gone off-contract – for example, a distributor whose agreement lapsed, or a retailer who agreed to sell only through certain channels and is now on the marketplace in breach. The legal exposure here is contractual and the enforcement tool is different again.

Why does this distinction matter before you file anything? Because filing the wrong complaint type can damage your own position. A trademark complaint alleging counterfeit goods against a seller who has genuine product can expose the brand owner or its representative to a tortious interference or wrongful takedown claim. In matters we handle, the first step is always to identify what the unauthorized seller actually has – and that usually means a test purchase before any filing.

Step one: gather evidence before you file

Solid evidence gathered before filing determines whether the complaint succeeds on the first submission and whether you are protected if the seller disputes it.

The minimum evidence set before filing any Amazon UK unauthorized-seller complaint includes the following:

A test purchase, received and documented – confirming whether the product is counterfeit, a genuine unit with diverted provenance, or something else. Keep the packaging intact. Photograph every side, the batch code, and any authentication marker.
The trademark registration details – the UK or EUTM registration number, the classes it covers, and whether the ASIN falls within those classes. Post-Brexit, the relevant trademark territory for Amazon UK enforcement is the UK (a GB or UK-designated EUTM). Confirm the registration is in force.
Brand Registry access – confirming the brand is enrolled and that the account filing the complaint is linked to the registered trademark owner. Amazon will not act on a Brand Registry complaint from an account that is not the rights owner or its named agent.
A screenshot of the listing, the seller's storefront, and any feedback or Q&A that reveals how the seller describes the goods.
If the case involves an authorized reseller gone off-contract: the relevant distribution agreement, the breach, and a record of any prior notice to the reseller.

A test purchase takes time, but it is rarely wasted. We regularly see brand owners file a counterfeit complaint on the assumption the goods are fake, only for the complaint to be investigated and rejected because the product – even if sourced outside the authorized channel – is physically genuine. That rejection is recorded, and it weakens the next filing.

Step two: choose the right Amazon UK complaint route

Amazon UK offers several distinct complaint mechanisms. Using the wrong one is the single most common filing error in matters we handle, and it delays resolution by weeks.

Brand Registry trademark complaint is the primary route when the issue is counterfeit goods or unauthorized use of the trademark on the listing. Through the Brand Registry portal ("Report a Violation"), the brand owner submits the ASIN, the trademark registration, and the evidence that the goods are not genuine or that the trademark is being misused. For straightforward counterfeit cases with strong test-purchase evidence, this route can produce an action within days.

Intellectual property infringement report (non-Brand Registry) is available to trademark owners not yet enrolled in Brand Registry, though with a materially slower and less certain outcome. Enrolling in Brand Registry before filing is almost always the better path if the brand qualifies.

Amazon's counterfeit complaint via Project Zero or Transparency applies only to brands enrolled in those programs. Our complete guide to IP and Brand Registry on online marketplaces covers the enrollment steps and what each program gives you that standard Brand Registry does not.

Seller Central report is the route for complaints that are policy-based rather than IP-based – for example, where the unauthorized seller is genuine but the brand has a formal authorized reseller policy filed with Amazon, or where the seller is violating listing policies independently of the trademark question. This route requires that Amazon has accepted and registered the brand's reseller policy, which not all brands have done.

Direct legal demand – a cease-and-desist or a formal notice of trademark infringement to the seller – operates in parallel with, or as a precursor to, Amazon filings. In some matters, particularly where the seller is based in the UK or EU and the goods are confirmed counterfeit, a legal demand accelerates resolution by making the seller's exposure clear before the Amazon process completes.

For sellers who have received one of these complaints and believe it was filed in error, the response is a counter-notice through Seller Central, supported by evidence of authorization, legitimate supply chain documentation, or a retraction request directed to the rights owner. A complaint from a brand does not automatically mean the seller did something wrong – and a well-structured counter-notice can result in the complaint being withdrawn. For more on the dynamics of gray-market enforcement on Amazon, see our analysis of what sellers need to know about a gray-market product complaint.

Step three: draft and submit the complaint correctly

The complaint filing itself is a structured document. Amazon UK's Brand Registry complaint form asks for specific inputs, and how you describe the infringement shapes how it is classified and routed internally.

State the trademark registration number and the jurisdiction clearly – for Amazon UK, this means a UK trademark (UK00XXXXXXXX) or a UK-effect EUTM. An EU trademark without a UK designation will not support an Amazon UK enforcement action post-Brexit.

Describe the infringement type accurately. If the goods are counterfeit, the description should make clear that the products are not genuine – supported by the test-purchase findings – and should not merely state that the seller is "unauthorized." The latter phrasing invites a gray-market analysis Amazon may not resolve in your favor. If the goods are genuine but the resale is trademark-infringing for a specific documented reason, state that reason precisely.

Attach documentation as image files in the accepted formats. Amazon's portal has file size and type restrictions; submissions that exceed these are silently truncated or rejected. A complaint that appears to have been submitted but carries no attachments because of a file-size error is one of the more frustrating procedural failures – and one that delays the timeline by the full review cycle.

Identify the specific ASIN and, where possible, the specific seller. A complaint against "all sellers on ASIN BXXXXXXXXX" will be processed, but targeted identification of the offending seller's storefront accelerates action against the right party without affecting other authorized sellers on the same listing.

After submission, Amazon typically sends a confirmation email with a case reference. Preserve this. All follow-up and escalation routes reference this case ID.

Where does this process go wrong?

The steps above describe the standard path. Your situation turns on the exact wording of the complaint notice, the account history, and the supply chain documentation – which is what we review first.

Four failure points account for a significant share of the stalled or rejected complaints in matters we handle.

Wrong trademark territory. A brand enrolled in Brand Registry using an EU trademark may not realize that enforcement on Amazon UK now requires a UK-registered trademark or a comparable UK right. The EU trademark exhaustion doctrine and the UK's independent exhaustion policy diverged after Brexit, and Amazon UK treats them separately. Filing against an Amazon UK ASIN using only an EUTM may produce no action.

Test-purchase not completed or not documented. Amazon UK investigations can and do request test-purchase evidence, particularly for high-volume sellers who have challenged prior complaints. A complaint filed without a completed test purchase – or with photographs that do not clearly show the product, batch codes, and packaging – is vulnerable to rejection after the seller disputes it.

Mismatch between the complaint type and the actual situation. Filing a counterfeit complaint for what is actually an unauthorized resale of genuine goods creates a risk. If Amazon investigates and concludes the goods are genuine, it may reject the complaint and record the filing. Repeated rejected filings can limit future enforcement actions against legitimate infringers.

The seller returns. Amazon's enforcement is ASIN- and listing-level. A removed seller can, in some cases, relist under a different account, add a variation, or open a new listing. Durable enforcement requires either a brand gate (which Amazon applies to certain brands that qualify) or a pattern of repeated filings that builds a documented history of infringement against the specific actor.

A worked example illustrates the sequence: a fashion accessories brand on Amazon UK (fall 2025) came to us after two rejected counterfeit complaints against the same seller. We reviewed the test purchase documentation, identified that the complaint had been filed using an EUTM without a UK designation, and refiled with the UK trademark. The seller was removed within the normal Amazon review window. The brand subsequently enrolled in Transparency to prevent recurrence on the affected ASINs.

The seller's perspective: what to do if you received this complaint

If you are the seller on the receiving end of an unauthorized-seller or IP complaint on Amazon UK, the first important point is this: a complaint from a brand owner is an allegation, not a finding. Amazon's process is not a court. A complaint that is inaccurate, overstated, or filed against a seller who has legitimate supply chain documentation can and should be challenged.

The practical steps for a seller disputing an unauthorized-seller complaint are:

Do not remove the listing immediately. Removal is not required by the complaint; it is a seller's voluntary choice. Once you remove the listing yourself, it can be harder to argue the complaint was wrong.
Gather your supply chain documentation: purchase invoices, supplier agreements, and any authorization letters you received. The documentation needs to show the goods are genuine and that your source was legitimate.
File a counter-notice through Seller Central using the case ID from the complaint. The counter-notice should directly address the basis of the complaint. If the brand alleged counterfeit goods, your counter-notice should include the supply chain evidence showing the goods are genuine. If the brand alleged you are unauthorized, and you have authorization, attach it.
Request retraction from the rights owner, where appropriate. If the complaint was sent by a brand that you have a current relationship with, a direct conversation – or a formal written request through counsel – can resolve it more quickly than waiting for Amazon's internal review.
If the complaint has resulted in a listing suppression or account health impact, consider whether the BSA dispute-resolution route applies. The path depends on the BSA version that applies to the account, which we check first.

The myth that a brand complaint always means the seller did something wrong is exactly that – a myth. In several matters we have handled, the complaint was filed against a seller who had full authorization, with documentation, and the issue was a breakdown in the brand's own distribution records. The resolution required a retraction from the rights owner, which we facilitated by presenting the supply chain evidence directly.

For a detailed look at how MAP enforcement and authorized reseller policy disputes play out on marketplaces more broadly, this case study on resolving MAP policy enforcement on a marketplace is worth reviewing before you respond.

The trade-offs: when to escalate beyond Amazon's internal process

Amazon's internal complaint-and-counter-notice system resolves a significant share of unauthorized-seller disputes without legal intervention. But it does not resolve all of them, and the decision to escalate has real commercial stakes for both sides.

For the brand owner, escalation options include:

A formal cease-and-desist letter to the seller, which creates a documented record of notice and strengthens any subsequent claim.
A UK civil claim for trademark infringement, where the goods are confirmed counterfeit and the seller can be identified. This is resource-intensive and typically reserved for high-volume or repeat infringers.
Referral to UK Trading Standards or HMRC for confirmed counterfeit goods at scale – a route that is available but moves on a governmental rather than commercial timetable.
Brand gating – a formal request to Amazon to require seller approval before listing on the brand's ASINs. This is not universally granted and has its own enrollment requirements.

For the seller, the key escalation question is whether Amazon's rejection of a counter-notice is the final word. It is not. The BSA provides a dispute-resolution path, and – depending on the account history and the nature of the complaint – there may be grounds to press Amazon directly or, where the rights owner's complaint was demonstrably improper, to pursue retraction through legal channels. As noted above, the applicable BSA terms govern the specific path, and those terms can vary by account.

The practical decision matrix: if the goods are confirmed counterfeit and the seller is identifiable, the brand should pursue both the Amazon complaint and a legal demand in parallel – the combined pressure resolves more quickly than either route alone. If the goods are genuine and the seller has supply chain documentation, the counter-notice route is the first move, with legal demand for retraction in reserve if Amazon's review does not resolve the complaint. If the situation is contractual – an authorized reseller in breach of their agreement – the right tool is almost always a direct legal demand or dispute-resolution step under the distribution contract, not an Amazon IP complaint.

If a first counter-notice or brand complaint already came back rejected, a second read can find the specific reason it failed and what, if anything, is still open. To discuss your situation, email info@tutamenlaw.com.

Related areas

IP & Brand Registry on Amazon and Other Marketplaces – trademark complaints, counter-notices, and brand protection strategy
Amazon Account Reinstatement – suspension and deactivation appeals, Plan of Action, performance and policy cases

Frequently asked questions

How long does resolving unauthorized seller on a brand listing usually take on Amazon UK?

Resolution time varies considerably depending on the complaint type, the quality of the evidence filed, and whether the seller disputes the complaint. A well-evidenced Brand Registry trademark complaint for confirmed counterfeit goods can produce a result within several days to a few weeks. Where the seller files a counter-notice, Amazon's review period extends the timeline, typically by several additional weeks. Matters that require legal escalation – a formal demand, a retraction request, or a contractual dispute with a reseller – take longer still, measured in weeks to months rather than days. Starting with complete documentation materially shortens the process.

What are the main risks if I handle unauthorized seller on a brand listing alone?

The primary risk for brand owners acting alone is filing the wrong complaint type and having it rejected, which creates a record that can complicate future filings against legitimate infringers. A counterfeit complaint against a seller who has genuine product can expose the brand to a wrongful-complaint or tortious-interference claim. For sellers, the main risk of handling a complaint alone is responding incompletely or in a way that does not address the specific allegation, leading to a listing suppression that a proper counter-notice might have prevented. In both directions, the cost of getting it wrong the first time is usually higher than the cost of getting proper advice before filing.

Do I need a lawyer for unauthorized seller on a brand listing?

Not every unauthorized-seller situation requires legal involvement. A straightforward counterfeit complaint with clear test-purchase evidence, filed by an enrolled Brand Registry rights owner, can often be handled by the brand or its Amazon account manager. Legal involvement becomes materially more valuable when: the complaint has already been rejected once; the seller has filed a counter-notice that Amazon has accepted; the goods are genuine and the dispute is contractual; there is a pattern of returning sellers; or the matter has produced an account health impact on either side. Attorney-led handling also provides a record of professional advice that is relevant if the dispute escalates to a formal legal claim.

About Tutamen

Tutamen is an independent law firm for online marketplace sellers. We represent Amazon, Walmart, Etsy and eBay sellers in account deactivations, frozen-funds recovery, intellectual-property disputes, arbitration and Notices of Dispute, and US federal Schedule A defense, plus EU marketplace regulation. Our work is attorney-led and confidential, with fees quoted up front after a short review. We act for founders, brand owners and in-house teams who need a specialist for a marketplace dispute. Matters are handled with full confidentiality, and our fee structure is fixed and transparent from the first conversation. To discuss your situation, email info@tutamenlaw.com.

By Priya Raman, IP & Brand Registry analyst, Tutamen

Published July 29, 2026

Page authored by Priya Raman, IP & Brand Registry Analyst, Tutamen.

Disclaimer: This article is general information, not legal advice, and does not create an attorney-client relationship. Marketplace policies and the law change, and every account and case is different. For advice on your situation, contact Tutamen at info@tutamenlaw.com.