Fix Error code 0xc004c008 when active windows with new key

Question

I recently bought a new Windows 11 Pro activation key, but when I enter it into my new PC, it shows error 0xc004c008: The key has already been used. I've tried resetting my PC and reinstalling Windows, but I still can't activate it. I tried activating it using my phone, but it can't find my Vietnam region. How can I activate it? Please help me activate it.

Answer 1

Hi,,

Did you buy this new key from Microsoft

or a 3rd party seller?

Had you used it prior to the new activation try?

more info = more help

Answer 2

To resolve the error code 0xc004c008, which indicates that the activation key has already been used, you can follow these steps:

1. Contact Microsoft Licensing Activation Centers: Since the error suggests that the key has already been used, you should reach out to Microsoft Licensing Activation Centers to verify the status of your activation key and potentially obtain a new one if necessary. You can find contact information for your region on the Microsoft website.
2. Check Activation Limits: If your key is a KMS key, remember that it can only be activated a limited number of times. If you have exceeded this limit, you will need to request more activations.
3. Use the Correct Key: Ensure that the key you are using matches the edition of Windows you have installed. If you have installed a different edition than what the key is for, it will not activate.
4. Try Internet Activation: If phone activation is not available for your region, ensure that your internet connection is stable and try activating Windows online again.
5. Reinstall Windows: If you continue to face issues, consider reinstalling Windows and trying the activation process again with the new key.

If these steps do not resolve the issue, you may need to consult with Microsoft Support for further assistance.

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References:

• Troubleshoot Windows activation error codes
• MAK activation: known issues