For Roblox, the Microsoft Store/Xbox balance route only works if you buy Robux through the Microsoft Store version of Roblox or on Xbox; it does not work on the Roblox website, mobile app, or regular PC app.

What to use

  • Microsoft gift card or Microsoft account balance.
  • Roblox gift cards bought directly from Roblox or approved retailers, if you want the standard Roblox redemption route.

What does not work

  • A Microsoft gift card on the Roblox website for Robux.
  • A Microsoft balance for the regular PC, mobile, or web Roblox checkout.
  • A Microsoft gift card is not the same as a Roblox gift card.

Simple rule

If you are using Xbox or the Microsoft Store Roblox app , Microsoft balance can be used. If you are using Roblox.com or the normal Roblox app, use a Roblox gift card instead.

Best choice

  • Choose Microsoft gift card if you plan to buy Robux through Xbox/Microsoft Store Roblox.
  • Choose Roblox gift card if you want the most direct and platform-neutral way to redeem Robux.

TL;DR: Microsoft gift cards support Robux only through the Microsoft Store/Xbox version of Roblox, while Roblox gift cards work through Roblox’s own redemption system.