Overview

Error 8566 is one of the more frustrating listing errors Amazon sellers encounter. It appears when you try to create a new product listing but Amazon determines your SKU doesn't match an existing ASIN and your submission isn't eligible for a new one. Understanding the causes behind this error can save you hours of troubleshooting and get your products listed faster.

Key Points / What Sellers Need to Know

• New sellers face listing limits — If you haven't built up a sales history on Amazon, your ability to create brand-new ASINs is restricted. This capacity grows as your sales increase over time.
• High-volume ASIN creators may be throttled — Even established sellers who have created a large number of new ASINs can have their creation privileges temporarily revoked by Amazon.
• Product ID and brand mismatches trigger the error — If your UPC, EAN, or GTIN doesn't match the brand name you've submitted, Amazon will reject the listing attempt.
• Weekly re-evaluation applies — If your ASIN creation ability has been removed, Amazon reviews your status on a weekly basis, so the restriction is not necessarily permanent.

What Causes Error 8566

This error stems from several possible root causes, and identifying the right one is the first step toward resolving it. For newer sellers, the issue is straightforward: Amazon limits how many new ASINs you can create until you've demonstrated consistent sales activity on the platform. This is part of Amazon's broader efforts to maintain catalog quality and prevent the creation of duplicate or low-quality listings. For established sellers, hitting this error often means you've been creating ASINs at a pace Amazon considers excessive, which can trigger an automatic cooldown period on your account.

The other major cause is a data mismatch between your product identifiers and brand information. When the standard product ID in your feed file — whether that's a UPC, EAN, GTIN, or JAN — isn't properly affiliated with the brand name you've entered, Amazon's system will block the listing from being created. This is a catalog integrity measure designed to prevent incorrect product data from entering the marketplace.