If you click on your Life360 Sensor under devices, but get an error and cannot access it, you may have to uninstall ST NewApp and reinstall it. I found this resolution in an old post. It was the only thing that got Life360 presence sensors working for me again. The “Member Location” utilizing the “Get your location from this phone” seemed to be just as unreliable for geolocation in the ST NewApp as ST Classic, (which I why I switched to Life360 in the first place).
Note: Once you sign in to the ST NewApp again, you won’t lose your settings, devices, automations, SmartApps, etc… however your main screen (rooms, etc.) will need to be re-ordered, as well as the devices in each of your rooms re-ordered. (The devices stay grouped in your rooms, but the order is reset.) Not the worst of problems, but just a heads-up.