"How to redeem a code on Xbox console;

Press the Xbox button to open the guide, and then select Store.
Press the View button to open the side menu, and then select Redeem.
Enter the 25-character code, select Next, and then follow the prompts.

How to redeem a code from a PC or mobile browser; 

From a web browser, go to redeem.microsoft.com.
Enter the 25-character code, select Next, and then follow the prompts."

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