Here are a few reasons why you might see activation error 0xC004F050:
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You entered a product key that can't be used to activate Windows. Enter a different valid Windows 10 product key or buy a new product key. For more info, see Activation in Windows 10.
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You upgraded to Windows 10, but the activation servers were busy. If you upgraded from Windows 7 or Windows 8.1, Windows 10 will be automatically activated, or you can select Activate and try again.
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You upgraded to Windows 10 using the free upgrade offer, but Windows 10 isn't activated after a reinstall. Windows 10 should automatically activate unless you made significant hardware changes (such as replacing the motherboard).
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For additional troubleshooting steps, please see Get help with Windows activation errors.
