To fix Windows activation error, running the Windows Activation Troubleshooter is the best way to go. If that does not help, change the activation method and see if that helps.

Fixes for activation errors after Windows 10 installation.

Fix Error Code 0x8007139f for Windows Update, Outlook (new) app, Activation, Microsoft account, Windows Defender, Xbox gaming or when using a PIN.

Dealing with activation problems The first thing to do is to check Settings, Update & Security, Activation to see if your copy of Windows has been activated. If you see Connect to the Internet to ...

Understanding Windows 10 activation Depending on how you get Windows 10, in some cases you're not supposed to need to type in a product key.