After days of pestering Amazon and going back and forth with various customer support reps throughout many different departments, I was finally able to retrieve a code to redeem NHL ‘94 Rewind from the PS Store.
The individual who was able to distribute the code to me was someone from their promotions and marketing team, so if you are in contact with Amazon’s customer support, ask specifically for someone from that department who could help you in retrieving your code.
Hope those of you who pre-ordered from Amazon are able to enjoy the game soon.