Key Activation for Windows products
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Select the Start button, then select Xbox.
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Sign in. If you don’t have a Microsoft account, sign up. If you’ve ever installed games from the Windows Store, use the same Microsoft account here.
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Select My games. Games you have on that device will appear there.
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Click on Find games in the Store.
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Select Redeem code option and enter your xxxxx-xxxxx-xxxxx-xxxxx-xxxxx key.