Who are you asking? Codes are sent out via email automatically up to 48 hours after making a qualifying purchase. There's no email notification regarding the promotion until they send the actual code to you.
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That's strange that some items are marked as qualifying for the DLC when they don't actually qualify. Amazon needs to fix that. I had a hard time finding a game I wanted because I didn't want something that I could get on PC.
I purchased Shadow of the Colossus for $18.60, on the item page, it shows that it's elgible for the DLC, but the price is under $19.99, and I didn't receive a code.
I purchased another game, Persona 5 for $19.99 which met the minimum price requirement and a few hours later, I got an email with a DLC code. The email specified it was for Persona 5, so I know I didn't get a code for the other game.
Amazon.com's finicky like that. People have used vpns to make it look like they're using a US ip to get some of the items to show up as in stock. I'm not sure if you need a seemingly US based account as well though.
The price after discount and before tax and such is tacked on must be $19.99 or higher for their system to recognize that it qualifies and email you the code. You should see something on the checkout page that mentions you've qualified for the chocobo:
https://i.imgur.com/srf4ImU.png
It would be good if they could tweak their system to not show the promotion on discounted items that dip below the required trigger amount.
Doesn't work, has to be a single qualifying item $19.99 or higher, after discount and before taxes, etc..
Edit: Ariane proved me wrong below, but you have to check the cart to see what mix of items actually qualify and it seems to be extremely particular about which items can be combined to trigger the promotion.
I'm just going by the cart. Even though I've already done the promotion, I can still see what would qualify by going to the checkout. The image I posted a few posts earlier was taken after I had already received a promotional code.
I put both the Shadow of the Colossus and one of the Sims 4 items, both of which have the promotion on their product pages, but neither of which is over $19.99 on their own in the cart and went to checkout. No mention of the promotion anywhere, so it didn't trigger it.