Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hi
Please first check whether the redemption completed despite the error. Sign in with the Microsoft account you used and check whether your new Office purchase appears or your Microsoft 365 expiry date has been extended:
https://account.microsoft.com/services
If it has not, open Microsoft Edge, press Ctrl + Shift + N to open an InPrivate window, and try redeeming your key here:
https://microsoft365.com/setup
For a Microsoft 365 renewal, use the same Microsoft account linked to your existing subscription and your newly purchased key. A previously redeemed key cannot be used again to renew.
If the error continues, please tell me which product you purchased—for example, Microsoft 365 Personal or Office Home 2024—and whether the error appears immediately after entering the key or when clicking Download. Please do not post your product key or account details here.