The rewards points can only be used to redeem gift cards through the Microsoft Rewards program, not items on the Xbox Store. You would have to use the points to redeem an Xbox gift card which would just add more currency to his account, but if he is having issues using his account balance, he still would not be able to make the purchase. If you redeemed the V-Bucks to a PC, Switch or mobile device, you can launch Fortnite and spend your V-Bucks! If you redeemed the V-Bucks to your XBOX or PlayStation, a secondary code was generated and it must be entered into your Microsoft or Sony account to complete the redemption. jcaH.

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