How to quickly resolve Windows activation error code 0xc004c020?

Many of our readers have reported errors 0xC004C020 when trying to connect their computers to their organization's servers. This error prevents activation of their Windows operating system.

While errors can be frustrating, we'll guide you through error 0xC004C020 when trying to activate Windows on an organization-linked computer.

What causes error 0xC004C020?

If you try to activate Windows on a computer that is linked to your organization and encounter error 0xC004C020, the possible causes may be as follows:

• Non-MAK Keys – If a non-MAK key is used on an organization-linked computer, the organization's policies will not allow it to be activated.
• Key access lost after formatting – Multiple activation keys can only be used once. If the computer has been formatted, the key cannot be repeated on its own.
• Activation Key Error – The activation key may be incorrect. This must be verified with the system administrator.
• MAK Key Usage Limit Exceeded – Windows keys used by organizations have limits on the number of systems on which they can be used. If this limit is exceeded, the key will not work.

Now that we know the reason behind the problem, let’s try to solve it.

How to fix 0xC004C020 activation error on Windows?

Before you continue troubleshooting an issue involving your organization, there are some quick solutions you can try:

Recheck the key you are typing and make sure it is correct.
• Make sure your computer is connected to your organization's network.
• Restart the computer.
• Please contact your IT server administrator.

If the initial solutions don't help, continue with the following solutions in order.

1. Use Command Prompt to activate the window

Click the
1. "Search" icon on the taskbar, type command prompt, and click in the results The "Run as administrator" launches the command prompt with full permissions.
Type the following command and click to execute the command (replace
2. [Product Key] with your actual product key): Enterslmgr. vbs /ipk [product key]<strong></strong>

The Windows system should automatically select the activation key, but if not, the

command prompt method may Helps.

2. Run the Windows Activation Troubleshooter

1. Right-click the Start button and select Settings from the menu. In the Settings menu, go to the System tab in the left pane.
2. In the right pane, select Activate.
3. If your Windows operating system is not active, then you will notice a button called "Troubleshoot". Click Troubleshoot to run the troubleshooter.
4. If the key was disabled after recent system changes, the Windows Activation Troubleshooter will pick up the key.

3. Activate the window by phone

1. Right click on the "Start" button and go to "Settings".
2. Go to "System" and select "Activate".
3. You will notice the option to activate Windows immediately. Below it, click Activate by Phone.
4. Select your country and click Next.
5. You will notice the installation ID and toll-free number. Call the toll-free number to obtain a confirmation ID.
6. Enter to confirm ID, and then select the activation window.

These solutions should help you fix the activation error, but if not, you can always contact Microsoft Support. Feel free to check out our general guide on troubleshooting common Windows activation issues.

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