windows hello is not available

That model does not have the necessary hardware for Hello. Only high end models support it. From MS-

• Windows Hello requires specialized illuminated infrared camera for facial recognition or iris detection, or a finger print reader which supports the Window Biometric Framework. Windows Hello with an Intel® RealSense™ (F200) camera requires a software update to work on Windows 8.1 devices after upgrading to Windows 10. This update is expected to be available soon.