Not all listings comply,  promotion boosts the item to the top of the search lists,  so eBay monitor each category as to to how many they can allow.  If every single application was accepted, there would be no point.

So if it's not there for your item,  it's currently,  not available for that category.

https://www.ebay.com/help/selling/listings/listing-tips/promoted-listings?id=4164

@pli6936