Yes, it is set, however when I added the custom add to cart button (via code block per your instruction), the waitlist doesn't appear.
waitlist enabled product : https://www.shufflehouse.co/shop/p/4-week-program
custom product page (in progress) with add to cart button added via code block (ID and collection linked to above waitlist enabled product per your instruction) : https://www.shufflehouse.co/1-on-1
As you can see, the waitlist doesn't appear when adding the add to cart via code block. Any ideas?