The listing, Five (5) days of Xbox Game Pass has ended.
Xbox One console:
Make sure you are signed into the Microsoft account for which you want to redeem the code.
From the Home screen, scroll right to Store.
Under Games, select Use a code.
Enter the 25-character code.
Use the onscreen keyboard to enter your 25-character code on the Enter your code screen, and then select Enter. Don't worry about hyphens, the system takes care of those for you.
Select Confirm.
Once your code is redeemed, you'll receive a confirmation message
Xbox Game Pass codes are redeemable up to thirty (30) days of Xbox Game Pass per account.