Xbox Activation Guide

To redeem your Xbox CD key, follow this Xbox activation guide.

Online (recommended)

Go to redeem.microsoft.com
Sign in to the Microsoft Account associated with your Xbox profile
Enter your 25-character code then follow the prompts

Xbox Series X|S and Xbox One console

Sign in to your Xbox console
From the Home screen, select and open the Store app. (If the Store app is not displayed, go to My games & apps, select Apps, and select the Store app from there.)
In the Store app, move the cursor left or press the View button on the controller to open the side menu
From that menu, select Redeem
Enter the 25-character code then follow the prompts