I have pre-ordered the rise of iron through gamestop and when I attempted to download the expansion through the game it said this, "Could not establish connection to the Xbox games store. New silver purchases will update when you next sign in." So I called Microsoft to see if it were an issue on their end and it turns out that I'm missing the license to the taken king, to which they cannot assist me with because I didn't buy it through the Xbox games store. Microsoft had mentioned my best bet is to get a hold of bungie with my issue to see if they would reinstate my license so that I may purchase and play rise of iron.
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Microsoft is just passing the Buck again. They handle the licences which are sent out by them when you buy the item. Bungie has nothing to do with the retail side of the game and all they could do is to see what licences you hold concerning Destiny.