can not find face lock feature on SM-N910F Note 4 phone

[AC Question]

I have try everything and am unable to find the face unlock feature on Samsung Galaxy S4 note phone. I can only see figure , pattern, swipe, password and None why don't i have face unlock feature? I am running Android 6.01

any support would be most welcome

 

[anon(5719825)]

Doesn't exist on my T-Moble Note 4/Note Edge. Looks like 6.0 removed that option.