Overview

Error 90227 occurs when a seller submits a product listing with a product type value that Amazon's catalog system does not recognize. This error message — "Unknown product_type" — indicates that the value entered in the product type field does not match any of Amazon's accepted product type definitions, preventing the listing from being created or updated.

Key Points / What Sellers Need to Know

• Root cause — This error is triggered when the product_type value included in a listing submission does not exist in Amazon's product type taxonomy for the target marketplace.
• Where it appears — Sellers may encounter this error when uploading flat files, using inventory feeds, or submitting listings through the SP-API or third-party listing tools.
• Immediate effect — Any listing submission containing an unrecognized product type will be rejected, meaning the product will not go live until the error is corrected.
• Common triggers — Typos in the product type value, using a deprecated product type, copying product types from one marketplace to another, or referencing outdated documentation are the most frequent causes.

How Product Types Work on Amazon

Every item listed on Amazon must be assigned a valid product type, which determines the set of attributes, required fields, and category placement for that listing. Amazon maintains a structured taxonomy of product types that can vary by marketplace. When a seller submits a listing — whether through Seller Central's Add a Product tool, a flat file upload, or an API call — the system validates the product_type value against this taxonomy. If the value does not match an existing entry, the system returns Error 90227 and the listing is not processed. Product types are case-sensitive and must be provided exactly as Amazon defines them.

Common Causes and How to Fix Them

The most frequent reason sellers encounter this error is a simple typo or formatting mistake in the product type field. Double-check the value for extra spaces, incorrect capitalization, or misspelled words. Another common scenario involves using a product type that was valid in the past but has since been deprecated or merged into a different classification. Amazon periodically updates its product type taxonomy, so values that worked previously may no longer be accepted. Sellers who operate across multiple marketplaces should also verify that the product type they are using is valid for the specific marketplace they are targeting, as product type definitions can differ between regions. If you are using a third-party listing tool or custom integration, ensure that the tool is referencing the most current product type definitions.