How to Fix Windows Activation error code 0x8004FC12 in Windows 10

What is ‘Windows Activation error code 0x8004FC12’ in Windows 10?

In this post, we are going to discuss on “How to Fix Windows Activation error code 0x8004FC12 in Windows 10”. You will be guided with easy steps/methods to resolve the issue. Let’s starts the discussion.

‘Windows Activation error code 0x8004FC12’: It is common Windows problem associated with Windows Activation error. This error indicates that Windows can’t activate now for some reasons. There could be several reasons behind this error including issue with Windows Activation servers or the activation server is busy, issue with internet connection, pending Windows update, interference of Windows Firewall/antivirus software and other reasons. Let’s take a look at error message.

“Windows can’t activate right now. Try activating again later. If that doesn’t work, contact support.”

 One possible reason behind this issue is problem with internet connection. You should make sure there is no issue with internet connection and its speed means you have stable internet connection. You can fix internet connection issue by restarting/resetting your router or other networking equipment you use for accessing the internet. Also, perform power cycle your router/modem and your computer to fix any temporary glitch in your router and computer.

As mentioned, Windows Activation error code 0x8004FC12 can be occurred if activation servers are busy. In such case, you will have to wait until activation servers are available. Sometimes, Windows Firewall or your third-party antivirus software cause interference when you trying to activate your Windows 10 computer. In such case, you can disable your firewall and antivirus software temporarily in order to fix the issue. Let’s go for the solution.

How to fix Windows Activation error code 0x8004FC12 in Windows 10?

Method 1: Fix ‘Windows Activation error 0x8004FC12’ with ‘PC Repair Tool’

‘PC Repair Tool’ is easy & quick way to find and fix BSOD errors, DLL errors, EXE errors, problems with programs, malware or viruses issue, system files or registry issues, and other system issues with just few clicks. You can get this tool through button/link below.

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Method 2: Check your internet connection and Check Activation Server status

At first, you should make sure there is no issue with your internet connection and its speed. You should have stable internet connection. Also, this error is occurred when Windows Activation servers are not available or is busy with activation requests. In such case, you will need to wait unit the activation server is available for you.

Method 3: Run ‘Windows Activation’ troubleshooter

Windows 10 built-in ‘Windows Activation’ troubleshooter can fix this issue. Let’s try.

Step 1: Press ‘Windows + I’ keys on keyboard to open ‘Settings’ App in Windows 10

Step 2: Go to ‘Update & Security > Activation’, find and click on ‘Troubleshoot’ link in right pane

Step 3: Follow on-screen instructions to finish troubleshooting. Once done, please check if the error is resolved.

Method 4: Disable Firewall/antivirus software temporarily

Sometimes, this error is occurred due to interference of Windows Firewall and third-party antivirus software installed in computer. You can disable Firewall and antivirus software temporarily in computer in order to fix the error.

Disable Firewall:

Step 1: Open ‘Control Panel’ in Windows 10 and go to ‘System and Security > Windows Firewall’

Step 2: Click on ‘Turn Windows Defender Firewall ON or OFF’ in left pane

Step 3: Check ‘Turn the Windows Defender Firewall OFF’ checkbox in both ‘Private’ and ‘Public’ network settings, and then save the changes.

Step 4: Once done, try activating Windows again and check if it works.

Method 5: Clean Up Excess Old Transactions

This issue can be occurred if there is pending Windows updates. Old pending updates may block the next updates requests from your system to the activation servers. You can run ‘FSUTIL’ command to clean up excess old transactions in your computer, in order to fix the issue.

Step 1: Press ‘Windows + X’ keys on keyboard and select ‘Command Prompt as Administrator’

Step 2: Type the following command one-by-one and hit ‘Enter’ key after each to execute. Make sure you are member of ‘Local Administrator group’

net localgroup Administrators localservice /add

fsutil resource setautoreset true C:\

netsh int ip reset resetlog.txt

Step 3: Once executed, restart your computer and try activating Windows again and check if the error is resolved.

Method 6: Activate Windows 10 by Phone

In Windows 8/8.1:

Open Charms bar from left or right of desktop screen by navigating mouse curser, and go to ‘Settings > Change PC Settings > Activate Windows > Activate by Phone’

In Windows 7:

Right-click on ‘My Computer or This PC’ icon on desktop, and select ‘Properties’ and go to ‘Activate Windows Now > Use the automated phone system to activate’

In Windows 10:

Press ‘Windows + R’ keys on keyboard, type ‘slui.exe 4’ in the opened ‘Run’ dialog box and hit ‘Ok’ button. This will let you activate your Windows via the telephone.

 Now, select our country region from dropdown and hit ‘Next’

You will see some toll-free numbers which you can call. You will be provided with confirmation ID over the call. Now, you need to enter this confirmation ID and hit ‘Activate’ button to activate your copy.


I am sure this article helped you on How to fix Windows Activation error code 0x8004FC12 in Windows 10 with several easy steps/methods. You can read & follow our instructions to do so. That’s all. For any suggestions or queries, please write on comment box below.

Samir Prakash Author