Companion app (android) mark away manually (device_tracker.see not compatible)

The device_tracker.see service doesn’t work with the Android companion app so how do I manually set such a device tracker to ‘not_home’?

I’ve just restarted my server as my son was travelling to school and home assistant still thinks he’s at home as that was the last position reported. As he arrived at school as the server was rebooting it’s stuck in this status until his phone moves enough to report a new location which will be at the end of the school day.

I’ve tried the device_tracker.see service but get the following in the log:

The see service is not supported for this entity device_tracker.zachphone_app