Overview

Error 4400 is a Seller Central error that prevents merchants from offering seller-fulfilled (MFN) products in certain categories. When this error appears, it means Amazon has restricted the seller's account to Fulfillment by Amazon (FBA) only, making any merchant-fulfilled offers unbuyable. Understanding this error and how to resolve it is essential for sellers who rely on flexible fulfillment options.

Key Points / What Sellers Need to Know

• Account restricted to FBA only — When Error 4400 triggers, your account has been limited to Amazon-fulfilled (AFN) shipments only, and any seller-fulfilled (MFN) offers will not be purchasable by customers.
• Multiple possible causes — The restriction can stem from policy violations, seasonal category restrictions, or a pattern of customer complaints against your seller-fulfilled orders.
• May not require action — If your affected listings are already set to FBA fulfillment and are live for sale, you can safely ignore this error since it does not impact FBA offers.
• Inactive offers after conversion — Even after converting a listing to FBA, the offer remains inactive until Amazon receives your inventory at a fulfillment center.
• Appeals are possible — If your seller-fulfilled privileges have been deactivated, you can submit an appeal through Seller Central to request reinstatement.

Why This Error Occurs

Error 4400 is triggered when Amazon determines that a seller should only fulfill orders through FBA rather than shipping products directly to customers. The most common reasons include unresolved policy violations on specific ASINs, seasonal restrictions that temporarily limit fulfillment options in certain categories, and elevated customer complaint rates on seller-fulfilled orders. When the restriction is in place, any attempt to list or maintain a merchant-fulfilled offer will result in the listing becoming unbuyable, effectively removing it from search results and product pages.

How to Resolve Error 4400

Sellers have two primary paths to address this error. The first option is to convert affected listings to FBA fulfillment. To do this, navigate to your Seller Central account, go to Inventory, and then Manage All Inventory. Use the available filters to locate the affected SKU, then select the option to convert it to FBA. Some products may require additional documentation or approvals before the conversion is complete. Once converted, keep in mind that the listing will remain inactive until Amazon physically receives your inventory at one of its fulfillment centers.