Fix error 0xC004C003 : Windows 10 failed to activate
Error code: 0xC004C003 Error Description: The activation key - Microsoft Community
KB5001692: Windows Activation fails with error 0xc004c003 on devices which have installed the Windows 10 January 2021 nonsecurity preview release or a later version
How To - How to fix Windows 10 error 0xc004c003 | Tom's Hardware Forum