Seems like this is a common issues that people are having when first setting up proximity
my config with zone listed incase that’s the problem
zone:
- name: home
latitude: !secret latitude_home
longitude: !secret longitude_home
radius: 50
icon: mdi:home
proximity:
home:
devices:
device_tracker.trevor
tolerance: 5
unit_of_measurement: mi
trevor is the friendly name of my device, I am using owntracks and that is reporting my location correctly