Before we go down to the real root of this problem first need to know that every software has an activation limit set by its developer or company, this means that all software license has an activation limit that is pre-defined by the developer or company and if the user tried to install the software and activate the license on multiple PC’s and break the activation limit then the license automatically gets Blocked or Suspended by the developers or companies activation server.

In simple language, the 0xC004C008 error code indicates that the activation server determined that the product key you entered has already been used on another device, or that the maximum number of activations for the key has been exceeded. This 0xC004C008 activation error occurs while activating Windows 7/8.1/10/11 product key.

Reasons why Product Key is Blocked by the Microsoft:

1. The user has activated the same Product Key on multiple PC/Laptops.
2. The user has shared or exposed the Product Key with a 3rd person or his/her computer vendor.
3. The user is using a pirated copy of Windows or Office or any other Software or Games which leaks the Product Key to the cracker/hacker.
4. The user’s PC/Laptop is under a virus or hacker attack which leaks the Product Key to the black market for sale.
5. User frequently formats and activates the Product Key on his/her PC/Laptop which sends suspicious behavior alerts to Microsoft Activation Server.

How to fix Windows 7/8.1/10/11 Activation Error Code 0xC004C008:

The only solution for this problem is to use Microsoft Phone Activation support, its very easy just follow the below steps as it is:

Step 1: Press the Windows Key + R to open the Run dialog box.

Step 2: Type “slui 4” (without quotes) and press Enter, this will open the Phone Activation window.

Step 3: Select your country or region from the list and click Next.

Step 4: Call the phone number listed on the screen and follow the automated prompts to enter your Installation ID.

Step 5: Enter the Confirmation ID in the corresponding fields on the phone activation window and click Activate Windows.

Wholla now your Windows license is fully activated.

Conclusion:
If you still face problems then you must contact your software vendor from whom you have purchased the Product Key and let their Customer Support team know the problem you face, if they are a genuine seller they will definitely help you, if required they will also give you a new replacement Product Key.

If you are looking to buy Windows & Office Product Key for your new/old PC/Laptop then you must check Windows & Office Prices list first.