So SharpTools simply picks up what SmartThings reports, so your hurdle is going to be getting SmartThings to report the location properly. Mine have always worked on Android, but it’s been hit or miss for others.
In the SmartThings app, select Menu (lower right), Settings (gear cog top right), Get Your Location from this Phone and make sure it’s turned on for your location.
In the Smartthings app, select the 3-dot menu (top right), Manage [your location], Geolocation. Ensure your home location is set properly. You can try expanding the radius.
In Android, from the Home screen, swipe down to open the shade and select Settings (gear cog top right), Apps, SmartThings and select Permissions, Location and ensure ‘Allow all the time’ is selected.