Geofence notification not sending on transition triggers

Question

So I followed the Google developers guide to monitor geofence transitions and for the most part it works. I set my location and the transitions happen as they should. The problem is that it only happens on the device I setup the geofence on. For example: I have devices A and B both running the same app. On device A I setup the geofence using my current location. I get a notification on device A that I entered the geofence. Meanwhile on device B I receive no notification.

Answer 1

So you set up a geofence on smartphone A and you expect it magically will be shared with smartphone B?

No, this is not how geofences works. They are local to the application instance, so nothing is visible outside of that application instance.

This is your, as developer, role to implement stuff which shares that geofence via some mechanism(*) with other application instance, register it there locally and react on the trigger.

(*) some mechanism can be Bluetooth, WiFi, cellular network, IrDa, etc.