The availability of Robux through Microsoft Rewards seems to fluctuate, with users often reporting that the 100 Robux gift card stock is restocked periodically. However, there is no fixed schedule for restocks, and it can vary from week to week or month to month.
Some users have mentioned that when the 100 Robux reward option is unavailable, it can take several days or weeks for it to return, depending on the stock and demand. If you’re waiting for it to restock, keeping an eye on the Microsoft Rewards page and checking periodically is a good strategy.
Additionally, you can explore alternative redemption options or keep an eye on notifications about restocks from Microsoft Rewards