eBay Error 21919303: The item specific [item specific name] is missing. Add [item specific name] to this listing, enter a valid value, and then try again.

Why this happens

The eBay Category or Product requires a particular Item Specific, but your listing does not include info for it. Why eBay enforces this: Some item specifics are required in each category so buyers can filter search results, for example Brand, Type or Size. Listings missing them are refused. When it usually happens: It usually appears after eBay adds a new required specific to a category, affecting existing listings on their next revision.

How to fix it

This error in other languages

German: Das Artikelmerkmal Marke fehlt. Fügen Sie Marke zu diesem Angebot hinzu, geben Sie einen gültigen Wert ein und versuchen Sie es dann noch einmal. French: La caractéristique de l'objet … est manquante. Ajoutez … à cette annonce, saisissez une valeur valide, puis réessayez. Italian: Manca la specifica dell'oggetto …. Aggiungi … a questa inserzione, inserisci un valore valido e riprova. Spanish: Falta la característica del artículo …. Añade … a este anuncio, introduce un valor válido y vuelve a intentarlo.