Anyone on 360 who can't access the Legendary Edition content, you just need to delete your game and re-download the Legendary Edition download again, ignoring the disc, since this includes the actual game. After you'll be able to download the game and its content that you purchased I don't know why it wasn't mentioned anywhere that we had to do this, since if we had just 1 of the previous DLCs, this was the only option to get The Taken King and it doesn't work without deleting your current game