In Amazon's advertising system, you may encounter discrepancies in the eligibility status of the same ASIN depending on whether it's viewed in Sponsored Products (SP) or Sponsored Brands (SB).

This difference arises because the teams managing SP and SB are distinct, including the teams responsible for eligibility moderation. As a result, the validation criteria for eligibility can vary.

A common scenario is when an ASIN is ineligible for SP but remains eligible for SB. This is due to the differing objectives of the two ad formats. SP focuses primarily on the individual product, which can become ineligible if the product is out of stock. Conversely, SB emphasizes promoting the brand's store, allowing ASINs to be featured even if they are out of stock.

If your situation doesn't match this explanation, it's recommended to contact Amazon support for further assistance.