Ad eligibility on Amazon — when an ASIN can actually run ads.

Ad eligibility is the most frequently violated, least well-documented rule in Sponsored Ads. Amazon's own documentation calls it "the criteria your ASIN must meet to serve ads." In practice it is a moving target: an ASIN that was eligible yesterday can be silently suppressed today because a single listing field changed.

This episode walks through every condition that determines whether your campaigns will actually deliver, in the order Amazon evaluates them.

The Buy Box is the gate

For Sponsored Products, this is the single most important rule: you must hold the Featured Offer (the Buy Box) for an ASIN in order to advertise it. If you lose the Buy Box, your ads stop serving for that ASIN — instantly, with no warning and no opportunity to bid your way back. The campaign stays "enabled"; it just stops getting impressions.

That is also why Buy Box price drift is dangerous for ad accounts. A 3 % undercut by a reseller can silently kill 40 % of your impressions for the day, while your reports still show enabled campaigns and "Delivering" status.

Stock and FBA eligibility

Out-of-stock ASINs lose ad eligibility within hours. Worse, Amazon's "low stock" signal — sometimes triggered by inventory thresholds you cannot see — can deprioritise impressions even when units are technically available. For top-of-funnel campaigns the rule of thumb is: keep at least 30 days of forward cover at projected sales velocity, ideally 45.

FBM (merchant-fulfilled) listings are ad-eligible, but they compete with FBA in the auction and almost always lose on delivery promise. If you advertise FBM, expect higher CPCs to win the same impression a Prime offer would have won cheaper.

Content suppression

Amazon will silently suppress an ASIN from search (and therefore from ad delivery) for any of:

• Missing required attributes for the category.
• An invalid main image — white-background and aspect-ratio rules are strict and enforced unevenly.
• Title length over the category limit.
• Restricted keywords in the title or bullets ("free", "100 % guaranteed", category-specific banned terms).
• Policy violations from prior buyer complaints.

The campaign UI does not tell you the ASIN is suppressed; it just shows zero impressions. Check Inventory → Manage All Inventory → Status, or run the suppressed-listings report, before assuming a low-impression campaign is a bidding problem. Nine times out of ten it isn't.

Restricted categories and gated brands

Some categories — medical, supplements, certain alcohol — are gated for advertising on top of being gated for selling. Even if you can list, you may need a separate approval to advertise. Sponsored Display in particular has stricter category restrictions than Sponsored Products.

Gated brands are a related trap. If your own brand is Brand-Gated and the registered owner is not the same Seller Central account, your campaigns can fail brand-name keyword eligibility checks without ever surfacing the error clearly.

Adult, hazmat and quirky edge cases

Adult-classified ASINs cannot run Sponsored Products on search. Hazmat-classified ASINs face inventory restrictions that often cascade into ad eligibility. Variations on a parent ASIN can be individually ineligible while siblings are fine, which makes parent-level reporting misleading.

The eligibility audit we run before every launch

1. Featured Offer (Buy Box) held on each ASIN for the last 7 days.
2. Inventory cover ≥ 30 days forward.
3. No suppressed-listing flag anywhere in the catalogue.
4. Main image and title pass the category rules.
5. If brand-targeted ads are in scope, Brand Registry status active.

If any of these five fail, fix the listing before launching the campaign. PPC cannot rescue a non-eligible ASIN; it just burns time and budget pretending to.