Default [Q] No facelock android 4.3 HP slatebook x2

Hi,

I got myself a slatebook x2 tablet, works fine but i cannot find the option to unlock the tablet by face reqonition.
Normally you can set this in the settings menu, but here the option is not listed.
I can chose from none to swipe, patorn, pin, and password but no face unlock.

My other tablet (asus tf201) has the face unlock option in the same menu, my old tablet (samsung tab 10.1) had this option aswell

I dont understand why i cannot find it, the tablet is 100% stock

Can someone tell me how to activate the faceunlock option (running android 4.3)?