Required item specific Brand is missing

eBay error 21919303 fires when the Brand item-specific is required for the chosen category but the listing doesn't include it. The listing won't go live until Brand is populated.

Most eBay categories - especially clothing, electronics, and home goods - require Brand as a hard-required item-specific. Cross-channel feeds often map brand inconsistently, leaving it blank for unbranded or generic products. eBay does not let you submit blank: even unbranded goods need 'Unbranded' explicitly.

1. Pull eBay's required-specifics list for your category via the Trading API or Seller Hub.
2. Map your feed's brand attribute to eBay's Brand item-specific.
3. For genuine unbranded goods, set Brand to exactly 'Unbranded' (not blank).
4. Don't use 'Does Not Apply' for Brand in categories where Brand is required.
5. Resubmit the listing through the Sell or Inventory API.

• Leaving Brand blank for handmade goods - eBay still requires 'Unbranded'
• Sending generic store names like 'Amazon Basics' for re-sold inventory
• Using 'N/A' or 'None' instead of 'Unbranded'