Redeem An Xbox Code

Go to Redeem Code
Sign in with your Xbox account credentials
Enter the 25-character code and click Next
The page will confirm the product you’re going to get, click Confirm to redeem the product to your account, it will inform you there are no refunds past this point

From the Home screen, scroll right to Store
Under Categories, select Games
Select Use a code. Or, say “Xbox, use code“
If prompted, sign in
Enter the 25-character code