I have the same problem, if you go on your Microsoft account on a computer, it will show that you have bought the game and own the license, under you purchase history, but under download history it's going to show "unknown title" basically the Xbox can't recognize what it is. Even after getting a refund and downloading it all over again, it still pops up that way. It's definitely a Bungie problem that Microsoft can't fix for us. All we can do is wait and see what Bungie dose