You may have tried this already, but Microsoft does have a specific troubleshooter for Windows Hello via the Get Help app and at https://support.microsoft.com/en-us/windows/troubleshoot-problems-with-windows-hello-bf68539e-e95e-48b6-a6cb-455649db3887. Though if all else fails, you could also try uninstalling and then re-installing the “Facial Recognition (Windows Hello)” feature via Settings > Optional Features and see if that helps any or not.

Haven’t had a ton of free time today to look over everything yet, but the Samsung display stuff I saw was pretty neat. Especially the transparent display. Lenovo also announced a neat 2-in-1 PC/tablet that runs both Windows and Android in their respective modes.