Looking around a bit, this appears to be because the pantheon-parental-controls-daemon was not running. I cannot find it in the systemctl service list.
I got it to work (with a few errors on the console) by running
sudo /usr/bin/pantheon-parental-controls-daemon
in a terminal window.
You can confirm it working by inspecting the tail of the /etc/security/time.conf file.
Looking around a bit, this appears to be because the pantheon- parental- controls- daemon was not running. I cannot find it in the systemctl service list.
I got it to work (with a few errors on the console) by running
sudo /usr/bin/ pantheon- parental- controls- daemon
in a terminal window.
You can confirm it working by inspecting the tail of the /etc/security/ time.conf file.