Hello,
I set up night light and auto dark mode theme which worked as supposed. Suddenly the night light won't function at all - regardless whether set automatically from sunset to sunrise or manually. Also, I have a browser extension Dark Reader which can dim/darken the visited websites. Similarly to night light, I've set up the Dark Reader to read the location data and to darken and lighten the pages based on that, but it darkens the webpages during the day too (before it functioned properly).
Location Services are turned on in Zorin OS. Also, Time Zone is properly selected too.
Take a look at this suggestion. Perhaps it can help to install beacondb. Newer versions of Ubuntu and Debian have already switched to beacondb geolocation service because MLS (Mozilla location services) have ended.
Edit geoclue config file to add beacondb location services this way:
sudo mkdir /etc/geoclue/conf.d
sudo tee > /etc/geoclue/conf.d/99-beacondb.conf <<EOF
[wifi]
enable=true
url=https://api.beacondb.net/v1/geolocate
# submit data, only possible with a GPS antenna
submit-data=true
submission-url=https://api.beacondb.net/v2/geosubmit
submission-nick=geoclue
EOF
sudo systemctl restart geoclue
You can undo it by removing the etc/geoclue/conf.d file when it doesn't work for you.
Which browser do you use?
Another possibility is to set your location manually.
Do you see this moon icon in the system tray when you enable night light?
As for the extension itself, I'm not familiar with it so I'm probably missing where the setting to get your location is... but I'm not seeing anything about it in the documentation. The only setting of that sort uses hard coded coordinates, is that what you're using?
Instead of the built-in Solution, You could try it with these Gnome Extensions:
There is a Warning for Ubuntu because of the customized Gnome Desktop, but maybe it works on Zorin; it has a different kind of Customization.
The next one would be:
Here You can't set up the Time but You are be able to set up Themes, Icons, Cursors etc. when switching from Light to Dark.
Maybe these 2 in Combination could work for You.