As you know, Windows 10 has a complicated mechanism for Activation which helps in the verification of a genuine copy of Windows 10. However, there are times when you might encounter some error during the activation process. One of these errors is the error code 0xc000f074. This kind of error could be due to the Key Management Service or KMS which is unreachable by the client computer or if the key used in the SLSetAuthenticationData function call is incorrect.

This kind of error mostly affects surfaces on computers that are upgraded from either Windows 7 or Windows 8.1 to Windows 10. In such cases, you may encounter any of the following error messages:

  • “Windows is unable to reach your company’s activation service. Please connect to your corporate network. If you are connected and continue to see the error, contact your system administrator. You can also click on the error detail to find the exact error. Error code: 0xC004F074.”
  • “Activating Windows(R),

(Key hash)…

Error: 0xC004F074 The Software Licensing Service reported that the computer could not be activated. No Key Management Service (KMS) could be contacted.

Please see the Application Event Log for additional information.”

  • “Error 0xC004F074, SL_E_AUTHN_MISMATCHED_KEY, The Software Licensing Service reported that the key is mismatched.”

To fix the Windows 10 Activation error 0xC004F078, you have to use the correct key for your type of Windows copy or use Command Prompt to reinstall the key or you could also try running the Activation troubleshooter.

Option 1 – Try running the Windows 10 Activation Troubleshooter

The first thing you can do to resolve the Activation error code 0xc000f074 is to run the Windows 10 Activation Troubleshooter. To do so, follow these steps:

  • Go to Settings and then select Activation.
  • After that, click on the Windows Activation and then troubleshoot. This will help you address most of the commonly found activation issues in Windows devices.

The Windows 10 Activation Troubleshooter will determine if your license key is a valid Windows 10 digital license for an edition which is not currently installed. If it turns out that it’s not, then the troubleshooter will show you how to install the correct edition.

Option 2 – Try to use the correct key for the type of Windows version you have

If the Windows Activation troubleshooter wasn’t able to resolve the error, then you can try using the correct key for your type of Windows version. All you have to do so is check the type of your Windows copy, if it’s OEM, retail or volume. And make sure that you have the correct, valid product key for your operating system.

Option 3 – Try to use Command Prompt to reinstall the key

  • In the Start Search, type “command prompt” and right click on Command Prompt from the search results and then select “Run as administrator”.
  • After that, execute this command to uninstall the existing key: vbs /upk
  • Next, you need to install the KMS product key by executing this command: vbs /ipk <The KMS Product Key>

  • Once you’re done, you will see a prompt that’ll tell you whether the operation was either successful or not.
  • To active the KMS product key online, use this command: vbs /ato
  • Use this command to activate the key using the telephone: exe 4
  • After you’ve activated the KMS product key, restart the Software Protection Service. You can also verify the Activation Status to check if your fix was successful or not.

Option 4 – Contact Microsoft Support for assistance

If you’re at your wits’ end in trying to upgrade your computer, you should consider contacting Microsoft Support for help as they can offer you various options that would make fixing Windows Activation error code 0xc000f074 a lot easier and faster.

If your Windows 10 computer is experiencing other system issues aside from the Windows Activation error code 0xc000f074, there is a one-click solution known as Advanced System Repair you could check out to resolve them. This program is a useful tool that could repair corrupted registries and optimize your PC’s overall performance. Aside from that, it also cleans out your computer for any junk or corrupted files that help you eliminate any unwanted files from your system. This is basically a solution that’s within your grasp with just a click. It’s easy to use as it is user-friendly. For complete set of instructions in downloading and using it, refer to the steps below.

  1. Turn on your computer. If it’s already on, you have to reboot

  1. After that, the BIOS screen will be displayed, but if Windows pops up instead, reboot your computer and try again. Once you’re on the BIOS screen, repeat pressing F8, by doing so the Advanced Option shows up.
  1. To navigate the Advanced Option use the arrow keys and select Safe Mode with Networking then hit
  1. Windows will now load the Safe Mode with Networking.
  1. Press and hold both R key and Windows key.

  1. If done correctly, the Windows Run Box will show up.
  1. Type in the URL address in the Run dialog box and then tap Enter or click OK.
  1. After that, it will download the program. Wait for the download to finish and then open the launcher to install the program.
  1. Once the installation process is completed, run ASR to perform a full system scan.

  1. After the scan is completed click the “Fix, Clean & Optimize Now” button.