UPDATE NOV 8…6:00pm EST: Microsoft has now supposedly fixed the activation problem, but users will still need to use the Activation Troubleshooter in Windows Settings to resolve problems on their own computer.
To do this:
In Settings, navigate to Update & Security > Activation and tap or click the link for the troubleshooter
Over the past couple of days, Windows customers have been experiencing their version of Windows seemingly downgrading itself from Windows 10 Pro to Windows 10 Home. At least that’s what the error message notification says.
Apparently, according to an acknowledgment by Microsoft, Windows is actually deactivating.
Microsoft has just released an Emerging issue announcement about current activation issue related to Pro edition recently. This happens in Japan, Korea, American, and many other countries. I am very sorry to inform you that there is a temporary issue with Microsoft’s activation server at the moment and some customers might experience this issue where Windows is displayed as not activated.
Our engineers are working tirelessly to resolve this issue and it is expected to be corrected within one to two business days.
This is yet another ongoing drama for the perpetual beta that is called Windows 10.