"Automatic Date & Time" doesn't reflect the service status
The issue was described on https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/1848309 using GNOME.3.34.1 'Always when I click on the slider the slider just goes back without adjusting anything.'
The user had ntp installed which is leading to have systemd-timesyncd.service disabled (through a 'ConditionFileIsExecutable=!/usr/sbin/ntpd')
The UI doesn't give any hint why the service can't be enabled though