Limited edition Mutiplayer skins not working for splitscreen

[tCheema]

My brother and I pitched half and half to get the limited edition. I was super stoked for this game. Before I got home to play, my brother decided to enter all the codes that came with the legendary edition, like the custom skin and emblem, along with the specializations. Now only he has access to them even though we play on the same console. What is the meaning of this? We just shelled out double the price for the base game and only one account gets the extra content? Please tell me if theres a workaround for this.