Hi Mitch h,
I understand how upsetting it must be to lose more than 16,000 points through an accidental sweepstakes redemption, especially when you had been saving them for Microsoft gift cards.
Microsoft Rewards orders are generally final once redeemed. However, refunds of points may be considered on a case-by-case basis, so I recommend submitting a request to Microsoft Rewards Support as soon as possible.
Please sign in with the same Microsoft account used for the redemption and explain that the entries were redeemed accidentally by your younger brother. If available, include the approximate date, number of points, sweepstakes name, and redemption order details. Please do not post any account or order information publicly here.
Please note that this is a user-to-user support forum. Moderators and contributors, including external Microsoft employees, cannot access Rewards accounts, cancel sweepstakes entries, or restore points through back-end systems. Only the Rewards Support team can review the redemption and determine whether an exception is possible.
You can also review the official Microsoft Rewards refund and exchange policy.
I hope the support team can review the circumstances and help you with this request. I know this isn't the news you were hoping for, but I wanted to make sure you got the most accurate information about your situation. Thank you so much for your understanding.
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