unable to turn on smart lock on lollipop 5.1

[AC Question]

hi,
i hv been surfing the internet and used each n every method
turned on smart lock in security>trust agents
uninstalled google play services updates and then reinstalled latest version 10.0.84
uninstalled outlook
cleared credentials etc etc
but smart lock is not turning on and icon is not showing up in security between owner info and encryption.
what to do next, plz help
thanks