Thread:Qbicle/@comment-34788131-20190225011316/@comment-1824272-20190225174557

"Participating retailers will provide two codes, one for the DLC and a separate code for Ace Combat 6. Both can be redeemed through the Store on your console."

Source: https://www.bandainamcoent.com/news/ace-combat-7-frequently-asked-questions

Check your Amazon codes and your emails.