Overview

Amazon Error 90001 occurs when a seller attempts to update a product listing, but the previous value for a specific attribute has been flagged as blocklisted by Amazon. This error prevents sellers from modifying certain listing fields because the existing data contains values that Amazon has restricted or prohibited. Understanding this error is essential for sellers who need to maintain accurate and compliant product listings.

Key Points / What Sellers Need to Know

• Blocklisted values are Amazon-restricted entries — Amazon maintains lists of attribute values that are no longer permitted on the catalog. When a listing contains one of these values, the system blocks further edits to that attribute until the issue is resolved.

• The error references a specific attribute and value — The error message identifies which attribute (such as brand, material, or color) is affected and shows the exact blocklisted value that is causing the conflict.

• Previous data is the trigger — This error is not caused by what you are trying to submit, but rather by what already exists on the listing. The existing value must be addressed before any update can proceed.

• Flat file and API submissions are both affected — Whether you are updating listings through Seller Central, inventory file uploads, or through the SP-API, this error can appear whenever Amazon detects a blocklisted value in the current listing data.

• Resolution typically requires a specific corrective update — Sellers generally need to submit a feed or update that replaces the blocklisted value with a compliant one, or contact Seller Support for assistance in clearing the restricted data.

How This Error Occurs

Error 90001 is part of Amazon's catalog quality enforcement system. Amazon periodically reviews attribute values across its catalog and adds certain values to a blocklist when they are deemed inaccurate, misleading, or non-compliant with category requirements. For example, a brand name that has been flagged for intellectual property concerns, or a material type that does not meet Amazon's standardized terminology, may be placed on the blocklist. Once a value lands on this list, any listing that currently holds that value becomes locked for edits on that attribute. The error surfaces when sellers attempt to make changes — even unrelated changes — that trigger a validation check on the affected attribute. This can be frustrating because the seller may not have originally entered the problematic value, especially on listings that were created through catalog contributions from multiple sellers.