I have never once heard or seen that two trade in promos worked together. The Gamestop system has always taken the promo that gives the customer the best value.
The last time I know this happened was for nba and the code definitely worked on Sunday. One store said it didnt work, but I had no problems at the next store.
Have GS Madden 21 preorder (Tony Romo) and preorder bonus of:
*1 of 32 NFL Team Elite Packs
*5 MUT Gold Team Fantasy Packs
*1 -Your Choice Uniform Pack
Want:
Paypal (make an offer)