Amazon returned this error because one or more mandatory attributes for the SKU's product type aren't filled. Attributes are how Amazon describes, categorizes, and surfaces your product — missing any required field blocks the listing.
Why it happens
- Incomplete product data. Not all required attributes were provided when listing or updating the product.
- Incorrect inventory file. The inventory file used is missing mandatory fields for the product type.
- Data entry errors. Errors or omissions during data entry.
- Category-specific requirements. Different product categories require different mandatory attributes — you may have missed some that apply only to this category.
How to fix it
- In the app, open the product and check which attributes are flagged as missing.
- Fill in the missing fields with values that match Amazon's spec for that product type.
- Re-upload the product.