Tado thermostat as presence detection sensor

I am trying to use the TADO sensor as presence detection sensor and i added it to my group.all_devices group, but it seems not working. My Samsung Galaxy S8+ too many times is detected as away for some minutes also if i am at home so i was thinking to add that sensor which seems more reliable. Has anyone experienced this and why this sensor seems not working?

This is my group of trackers:

Trackers:
  name: Trackers
  entities:
    - device_tracker.galaxy_note_3
    - device_tracker.galaxy_s8
    - sensor.living_room_tado_mode
    - input_boolean.mauhome