Sign in with your Microsoft account credentials (make sure you’re signed in with the Microsoft account you want to redeem the code with).
Enter your unique code that’s displayed on the ‘Orders’ page of CDKeys.com and select Next, and then follow the prompts.
Microsoft Store on Windows:
On your PC, press the Start button , and then enter the store into the search bar.
Choose Microsoft Store from the results to open the app and sign in with your Microsoft account credentials (make sure you’re signed in with the Microsoft account you want to redeem the code with).
Select your account in the top-right corner of the screen, and then select Redeem code or gift cards.
Enter your unique code that’s displayed on the ‘Orders’ page of CDKeys.com and select Next, and then follow the prompts.
Xbox App for Windows (ONLY PC):
On your PC, press the Start button , and then enter Xbox into the search bar.
Choose the Xbox app from the results to open the app and sign in with your Microsoft account credentials (make sure you’re signed in with the Microsoft account you want to redeem the code with)
Select your gamerpic, and then select Settings.
Select Redeem under Redeem a code.
Enter your unique code that’s displayed on the ‘Orders’ page of CDKeys.com and select Next and then follow the prompts.
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Platform 
-91% Assassin's Creed Unity XboxSpecial Price $4.59 RRP $53.19
-82% Battlefield 1 Revolution Inc. Battlefield 1943 XboxSpecial Price $11.99 RRP $66.49
