The specified domain is not mapped to the category.
Why this happens
Every eBay listing must be in a valid leaf category — not a parent or deprecated category. eBay periodically retires categories, so old listings or templates may reference IDs that no longer exist.
How to fix it
Look up your product's leaf category at eBay → Seller Hub → Listing Tools → Category Lookup.
Use the GetCategories API call (Trading API) or the Sell Catalog API to validate category IDs programmatically.
Don't list at the parent level — eBay redirects buyers to the leaf category and may block parent-level listings.
If the category was deprecated, eBay's listing tool will suggest a successor — use that instead.
Common pitfalls
Hardcoded category IDs in feed templates — refresh from eBay's current taxonomy quarterly
Cross-listing the same product to the same category in multiple sites (US, UK, AU) — each has different IDs
