Configuring MQTT on Hass.io

Installation Home Assistant OS
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9

try this

switch:
  - platform: mqtt
    name: "AIG"
    command_topic: "room/AIG1/status"
    state_topic:  "room/AIG1/switch"
    qos: 1
    payload_: "ON"
    payload_off: "OFF"    
    retain: true