This has been happening way, way, too often for my liking.
RT @pcworld@twitter.com Activation bug bites Windows 10 PCs, falsely reporting PCs as unactivated, or telling users their Windows 10 Pro PCs are running Home. Microsoft is working on a fix (and there's a troubleshooter, too). https://www.pcworld.com/article/3319697/windows/windows-10-activation-problems-november-2018.html via @markhachman@twitter.com