Windows 10 0xC004C008 activation problem solution

Activation failure0xC004C008 occurs if the 25-digit cipher specified during activation has already been applied on another computer. It occurs not only in the tenth, but also in all other popular versions of Windows.

To fix the situation, try:

• Check if you have used this code on another PC. If this is confirmed, deactivate the product key.

To do this, open the command prompt by entering the search querycmd.

Then typeslmgr /upk in the interface. And press Enter

Click “Ok” to revoke the key.

• In the case of a KMS key, make sure that the number of devices on which it is used does not exceed the allowed number. You can enter the KMS key up to 10 times on 6 different PCs.
• If the first two recommendations did not help, contact the software vendor for advice.

Important! The above instructions are relevant only for users with a licensed operating system.

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