Windows 10 has a complicated mechanism for Activation. It helps in the verification of a genuine copy of Windows 10. But sometimes, it throws the error code 0xc000f074. It is caused if the Key Management Service or KMS is not reachable by the client computer or if the key used in the SLSetAuthenticationData function call is incorrect. This error code mostly surfaces on computers that are upgraded to Windows 10 from either Windows 7 or Windows 8.1.
The error could appear as either of the following depending upon where you encounter it:
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 0xC004F078, SL_E_AUTHN_MISMATCHED_KEY, The Software Licensing Service reported that the key is mismatched.
You can run the Activation troubleshooter. The Windows Activation Troubleshooter will help you address most commonly encountered activation issues on Genuine Windows devices including those caused by hardware changes.
Anand Khanse is the Admin of TheWindowsClub.com, a 10-year Microsoft MVP Awardee in Windows (2006-16) & a Windows Insider MVP since then. Please read the entire post & the comments first, create a System Restore Point before making any changes to your system & be careful about any 3rd-party offers while installing freeware.