I have a MacBook Pro running High Sierra 10.13.3 where the location function isn't working.
I purchased a new MacBook Pro for my user John. His old MacBook Pro was reformatted, and High Sierra was installed. Then, it was given to Sally. Prey 1.7.3 is installed on both John and Sally's laptops. I can see both devices in my Prey panel. While John's laptop will provide a location, Sally's will not. I have tried reinstalling Prey, reactivating Prey, rebooting, and running the patch (it says bug not found). I have also confirmed that Sally's laptop is on Wi-Fi and allowing Wi-Fi based location services. Every time I click on Sally's laptop in the Prey panel, it says "Unable to reach device."
I'm not sure if this issue is related to Sally's laptop being previously listed in Prey panel as John. I'm happy to provide any further details to get this working. It's driving me nuts!