Overview

Amazon Error 100404 is a feed processing error that occurs when sellers attempt to update a product listing attribute, but the new value is deemed too similar to the existing one. When triggered, Amazon suppresses the submitted attribute value, meaning the update is rejected and the original data remains unchanged. Understanding this error is essential for sellers who regularly maintain and optimize their product listings.

Key Points / What Sellers Need to Know

• Attribute updates must show meaningful improvement — Amazon compares your submitted value against the existing attribute data and rejects changes that don't meet a minimum improvement threshold.
• Minor rephrasing is not enough — Simply rewording an existing attribute value without adding substantive new information will trigger this error.
• The error appears in your feed processing summary — You'll find the specific attribute name flagged in your processing report, making it easier to identify which field needs attention.
• Suppression means your update was ignored — When this error fires, your original attribute value stays in place and the submitted change is discarded entirely.
• Resubmission is possible after corrections — Once you've revised your attribute value with genuinely improved content, you can resubmit your template file.

How This Error Works

When you submit a product feed or update a listing attribute through Seller Central, Amazon's system runs a comparison between your proposed value and the value currently stored for that attribute. If the system determines that the difference between the two values is too minor — essentially a lateral move rather than an improvement — it blocks the update and returns Error 100404. The threshold for what constitutes a "sufficient improvement" is set by Amazon's internal algorithms, and it applies broadly across text-based attributes such as product titles, descriptions, bullet points, and other catalog fields.

For example, if your current product title reads "Men's Cotton T-Shirt" and you attempt to change it to "Men's Cotton Tee," Amazon would likely reject that update because the change is purely cosmetic. Similarly, changing "Running Shoes" to "Running Footwear" would be flagged since the update doesn't introduce any new or useful product information — it simply substitutes one synonym for another.