Hi there,
I'm Cherrelyn, and I'm here to help.
That error usually appears when there’s a temporary issue with Microsoft’s activation or redemption service. If you've already tried refreshing the page or switching browsers, it may simply be a timing issue. I suggest waiting a bit and trying again later. If it persists, restarting your device or redeeming the code from another network can also help rule out connection issues.
Warm regards,
Cherrelyn