My cousin and I gameshare and he had previously purchased Destiny on the 360 so he ported it to Xbox One. It worked fine until I bought The Taken King DLC yesterday. It now works perfectly fine for him and whenever i try to play it says i'm in a "Trial Mode". I contacted Xbox Support and they said I should contact bungie because by the laws of gamesharing I should be able to play the full game. They said that apparently The Taken King is asking for the Xbox one License of Destiny and it's working for my cousin but not me.
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You messed up by purchasing it on your account. You should have given him the money, and let him buy it on his account.