How to Activate Windows 11 Enterprise or LTSC

1. Open the Windows 11 activation page

Open Settings, select System, and then choose Activation. This page shows the installed edition and current activation state.

2. Enter the Windows product key

In Change product key, select Change. Administrator approval may be required before the key window opens.

Type or paste the full 25-character key, select Next, and wait while Windows checks the license.

3. Review the activation result

If the activation page shows Windows is activated, the license was accepted and no telephone activation is required.

If Windows shows error 0xC004C020, error 0xC004C008, or another online activation message, continue with telephone activation. This is common for some Enterprise or LTSC activations and does not automatically mean the key is invalid.

4. Open telephone activation with slui 4

Press Windows + R to open the Run window. Type slui 4 and select OK. This opens the Windows telephone activation wizard.

5. Copy the Installation ID

Select your country or region and continue. If your location is unavailable, select another listed country; this does not change the Windows language or region.

The wizard displays an Installation ID (IID) divided into groups. Copy every group in the displayed order.

6. Get your Confirmation ID

Use one of these methods to exchange the Installation ID for a Confirmation ID (CID):

1. Microsoft Product Activation Portal: the official, free option. It is manual: sign in, choose product activation, select Windows, and enter the IID groups.
2. InstantLicX Telegram bot: a faster paid option. Send the IID to the Telegram bot as text or as an image.
3. GetCID.xyz: a paid web service that accepts the IID as text or image and also supports API, WordPress, WhatsApp, and Telegram integrations.

Using the free Microsoft portal

Open the Microsoft Product Activation Portal, sign in with a Microsoft account such as Outlook or Hotmail, and choose Activate a Microsoft Product.

Select Windows, choose the Windows version that matches your installation, and continue until the portal requests the Installation ID.

Paste the complete Installation ID, verify the groups, and submit it.

If the portal asks how many computers have been installed with this copy and this is a new activation, enter 0.

7. Enter the Confirmation ID

After the IID is accepted, the selected method returns a Confirmation ID divided into groups.

Return to the Windows activation wizard and enter each CID group into its corresponding field. Select Activate Windows to finish.

8. Confirm Windows 11 activation

Return to Settings > System > Activation. The activation state should now confirm that Windows is active.

Troubleshooting

• Verify that the installed Windows edition is Enterprise or LTSC before using this guide.
• If slui 4 does not open, restart Windows and try again with administrator permissions.
• Check every IID and CID group before submitting or entering it.
• If Windows reports error 0xC004C020, telephone activation is usually the required next step.