I don’t remember exactly how it needs to be set up. If I go to game to buy something it will automatically take money from the gift card, I just have to confirm I want to buy it. So in the game, when you buy something you don’t need to each time choose the form of payment. It means, I believe, it has to be set up in a different way butI don’t remember how. I used google to help me out with it as I also had problems and thought I just wasted money on the gift card.
Do you have that online account set up with your information ?
I also remember I had some kind of issues with the first purchase in RR2 (it was the first windows store purchase ever), as I didn’t work in RR2 I tried to make the cheapest purchase possible from Windows Store, I managed to do it and later it worked in RR2. Idk but maybe it was the deal ? If you make purchase in the game you cannot choose the gift card payment option, but if you buy in the store you can choose it and later it will work afor all your further purchases ? I don’t remember but I had to do a small purchase in the store first, that’s for sure.