How to redeem Xbox and Microsoft Store codes and gift cards

Want to redeem that shiny new Xbox Gift Card code? Maybe an Xbox Game Pass time card code? Perhaps it's even a new game?!
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Red Dead Redemption's free Xbox Series X upgrade is currently broken with fans baffled after being asked to buy the whole game again, but Rockstar is "working with Microsoft to ...

Rockstar Games launched a free current-gen update for digital owners of the original Red Dead Redemption, but Xbox players noticed they were unable to make the leap from the Xbox 360 version to the ...