Creating new areas by editing the configuration.yaml has no effect

Having added magic_areas successfully, restart and observe that areas exist:

magic_areas:

Now create (or edit) areas by editing the configuration.yaml, and restart.

magic_areas:
  the_new_or_existing_area:
     include_entities: 
       - binary_sensor.front_door
       - binary_sensor.entrance_motion

Nothing happens, after restart the_new_or_existing_area does not exist.

[ontolo-zz]

It works as you have described. Thank you for your help which resolved my problem.

magic_areas:
  hallway:
     presence_sensor_device_class:
       - door
       - motion    
     include_entities: 
       - binary_sensor.front_door

Now the hallway magic area contains both the magically discovered area sensors AND the added door sensor, this is correct.

binary_sensor.area_hallway

binary_sensor.entrance_motion, 
binary_sensor.front_door, 
switch.area_presence_hold_hallway

[jseidl]

Also the slug is without area. In your case would be just hallway