No devices in Google Assistant

I’d like to use Google Assistant and using this tutorial I’ve configured my Home Assistant.

However, no devices show up when I connect my “[test] Home Assistant” account.

I think I need some help with my configuration. This is my groups configuration:

woonkamer: #livingroom
  name: Woonkamer
  entities:
    - switch.neo_coolcam_power_plug_12a_switch
    - switch.wenzhou_tkb_control_system_tz68_onoff_switch_socket_switch
    - switch.wenzhou_tkb_control_system_tz68_onoff_switch_socket_switch_3
    - switch.wenzhou_tkb_control_system_tz56_wall_switch_onoff_switch
    - media_player.woonkamer_audio
keuken:
  name: Keuken
  entities:
    - switch.aeotec_zw075_smart_switch_gen5_switch
    - switch.wenzhou_tkb_control_system_tz68_onoff_switch_socket_switch_2
    - switch.wenzhou_tkb_control_system_tz56_wall_switch_onoff_switch_2
eetkamer:
  name: Eetkamer
  entities:
    - light.qubino_zmnhdd1_flush_dimmer_level
werkkamer:
  name: Werkkamer
  entities:
    - switch.aeotec_zw075_smart_switch_gen5_switch_2
    - climate.danfoss_popp_radiator_thermostat_heating_1

And this is my Google Assistant configuration:

google_assistant:
  project_id: MY_PROJECT_ID
  api_key: MY_API_KEY
  exposed_domains:
    - SWITCH
    - LIGHT
    - GROUP
  entity_config:
    switch.neo_coolcam_power_plug_12a_switch:
      name: Televisie
      room: LIVING_ROOM

Is this configuration correct? Or do I miss something? When I remove entity_config all my devices are added to my Google Assistant, but that creates a unusable mess.

Add below to your google assistant configuration

expose_by_default: false