Yes, it’s possible to use Microsoft Rewards for Robux. This allows users to earn points by completing simple tasks, like using Bing, shopping at the Microsoft Store, or taking part in daily quizzes.

How to get Robux in Roblox. While you can earn free Robux by making games for the platform (especially if they're successful), it’s far more likely that you’ll acquire Robux by buying them.

Microsoft Rewards is one way to get Robux in Roblox. However, this is not a steady method since you won't get the currency each time you watch a video or play a game.