group:
  simulation_lights_all:
    name: Simulation Lights (All)
    entities:
      - switch.tasmo_ks811d_1242_entrance_a
      - switch.tasmo_ks811d_6110_kitchen_a
      - switch.tasmo_ks811d_6110_kitchen_b
      - switch.main_hallway_lightswitch_tasmo_ks811s_2940_hallway_1a
      - switch.tasmo_ks811d_1701_stairs_2a
      - switch.tasmo_ks811t_0702_lounge_3a
      - switch.tasmo_ks811t_0702_lounge_3b
      - switch.tasmo_ks811t_0702_lounge_3c
      - switch.esp_entrancebathrmlights_relay_1_main_lights
      - group.downstairs_flat_lights # ← now valid here