I added FAQs to a product but they do not appear on the storefront. What should I check?

Check these in order:

1. In Product FAQs → Settings, Show FAQs on product pages must be ticked, then click Save settings. While it is off, FAQs are hidden on product pages and the store-wide /faq page shows nothing either.
2. On the Product FAQs tab, make sure you added them under the right Product ID. The easiest way is to open the product and click its FAQs tab, which fills in the product for you.
3. Make sure the Product FAQs plugin is active for your store. If it is not, the admin page says the plugin is not active.

Store-wide questions go on the Global FAQs tab instead and appear on the /faq page, not on a single product.