Amazon Error 5665: Brand Not in Brand Registry

Error 5665 stops your flat file upload dead. The full message reads: "The brand name specified in the Brand Name attribute does not match the brand name associated with the seller account. Ensure the seller is enrolled in Amazon Brand Registry." In plain language, Amazon looked at the brand name in your file, checked whether your seller account is registered to sell under that brand, and said no.

This is one of the most common flat file rejections, and it has three distinct causes with different fixes. This guide walks through each one so you can identify which applies to you and resolve it without guesswork. For a broader overview of flat file errors, see our flat file errors guide.

What causes error 5665

Three scenarios trigger this error. They look similar in the processing summary but require completely different fixes.

1. Your brand is not enrolled in Brand Registry

If you own the brand but have not enrolled it in Amazon Brand Registry, every flat file row that carries that brand name will fail with 5665. Amazon introduced this validation to reduce counterfeit listings, and it applies to all new ASIN creation where no valid GTIN is provided.

2. The brand name does not match exactly

You are enrolled, but the brand name in your flat file differs from the name in Brand Registry. This is surprisingly common. A trailing space, a missing hyphen, an ampersand written as "and", or even an accented character can cause a mismatch. Amazon does not perform fuzzy matching on brand names. If your registration says "Smith & Co" and your flat file says "Smith and Co", error 5665 fires.

This is, frankly, the most frustrating variant of the error because you have done everything right except type one character differently. And the error message gives you no hint about which character is wrong.

3. The brand belongs to another seller

If the brand name in your flat file is registered by a different seller, Amazon will not let you create a new listing under that brand. This applies whether you are trying to list genuine products or have simply used a brand name that happens to be taken.

How to fix error 5665

The fix depends on which of the three causes applies. Work through these in order.

Check your Brand Registry status

1. Sign in to brandregistry.amazon.co.uk (or the equivalent domain for your marketplace).
2. Go to Manage, then Brands.
3. Confirm the brand appears in the list and its status is Active. A pending or rejected enrolment will not clear the error.
4. Copy the brand name exactly as it appears in Brand Registry and paste it into your flat file. Do not retype it manually.

If you are not enrolled: enrol or use a GTIN

If you own the brand and have a registered trademark, enrol in Brand Registry. You will need the trademark registration number (not an application number) and the brand name must match the trademark exactly. Enrolment typically takes two to ten business days once submitted.

If you do not have a registered trademark, you have two options:

• Provide a valid GTIN (UPC or EAN). Amazon uses the barcode to match to an existing catalogue entry, and Brand Registry is not required for barcode-verified products.
• Apply for a GTIN exemption. Amazon grants these for certain categories and brands. Go to Add a Product in Seller Central, search for your product, and follow the GTIN exemption link if it appears. Not all categories or brands are eligible.

If the brand name does not match: correct the flat file

This is the quickest fix but also the easiest to get wrong. The brand name in your flat file must be character-for-character identical to what Brand Registry shows. Watch for:

• Trailing or leading spaces
• Double spaces between words
• "and" vs "&" or "+"
• Hyphens vs en-dashes
• Accented characters (e.g. "e" vs "e" with an accent)
• Capitalisation differences (the match is case-insensitive, but check anyway)

The safest approach: open Brand Registry, copy the brand name, and paste it directly into every row of your flat file. Do not hand-type it.

Reseller scenario: selling brands you do not own

If you are reselling products from a brand you do not own, you do not need Brand Registry. What you need is a valid GTIN for each product. Amazon uses the barcode to match your offer to the existing listing created by the brand owner (or another seller).

In this scenario, you are adding an offer to an existing ASIN, not creating a new one. Your flat file should include the ASIN or the product barcode (UPC/EAN) and leave Brand Registry out of the equation entirely.

If the product genuinely has no barcode, you face a harder path. GTIN exemptions for brands you do not own are rarely granted. Your best option is to source products that come with valid barcodes, or contact the brand owner to obtain them.

How this interacts with GTIN and UPC requirements

Error 5665 and GTIN requirements are closely linked. Amazon uses two mechanisms to verify a product listing is legitimate: Brand Registry enrolment (proving you have the right to sell under a brand) and GTIN validation (proving the product is real via its barcode).

If you have Brand Registry, Amazon is more lenient about missing GTINs because your brand enrolment already establishes trust. If you do not have Brand Registry, a valid GTIN becomes essential. Without either, your listing will not go through.

There is a practical hierarchy:

1. Brand Registry + GTIN: Best case. Both verification mechanisms satisfied.
2. Brand Registry, no GTIN: Usually accepted for new ASINs if your brand is enrolled.
3. No Brand Registry + valid GTIN: Accepted for adding offers to existing ASINs.
4. No Brand Registry + no GTIN: Rejected. Error 5665 fires. You need one or the other.

Preventing error 5665 before you upload

The most efficient way to avoid this error is to catch it before your file reaches Amazon. A pre-upload audit that checks every brand name in your flat file against your Brand Registry enrolment will flag mismatches before they become processing errors.

Our flat file monitor covers how to track errors after upload, but the real win is stopping them before submission. Check each brand name against your registry, verify that GTINs are present where Brand Registry is not, and confirm the exact spelling before you click upload.