Trident-Tech

If your copy of Windows 10 is suddenly not activated, and will not activate, this may be why. (Microsoft is having activation server issues.)

https://www.ghacks.net/2018/11/08/microsoft-is-having-activation-server-issues-right-now/

https://www.forbes.com/sites/jasonevangelho/2018/11/08/windows-10-pro-licenses-are-being-downgraded-to-windows-10-home/

Microsoft is having Activation Server issues right now - gHacks Tech News Reports are coming in from all over the Internet that Windows 10 licenses get revoked on some systems currently and that activation is not available either at the time of writing.