Microsoft is investigating issues with Windows activation where users who upgraded to Windows 10/11 for free from Windows 7/8 are having their copies deactivated when they change hardware ...

Windows 11/10 Activation error 0xC004F012 occurs because of a missing or corrupt licensing repository. It can occur first-time activation or after a major upgrade ...

A recent update to the Microsoft Activation and Validation unintentionally caused a "not genuine" error on volume-licensed Windows 7 clients that had KB 971033 installed.