If products don't appear in quiz results on the storefront:
Check product availability — Only products published to the Online Store sales channel are shown. Draft or hidden products are excluded.
Check inventory status — Out-of-stock products may be filtered out. Ensure products have inventory or have "Continue selling when out of stock" enabled.
Verify the product is assigned — Open the quiz in the builder and check that the terminal options have the correct products attached.
Product availability in region — If you use market-specific publishing, ensure the product is available in the shopper's market.