Mqtt discovery not adding my sensor

hi,
I’ m struggeling to create new devies with the mqtt discover. It general works because the tasmota device are appearing well. But my custom device refuses to show up.

The mqtt broker show a - I guess" valid json in the config topic

Nachricht 82 empfangen auf homeassistant/sensor/systa_two/config um 14:22:
{
    "device_class": "temperature",
    "name": "two",
    "unique_id": "systa_two",
    "state_topic": "homeassistant/sensor/systa/state",
    "unit_of_measurement": "C",
    "value_template": "{{value_json.two}}",
    "platform": "mqtt"
}

Anything I am missing?

Andreas

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device:{}

Yes, you are right. I found this as well Late last Night.

It would be nice If Someone can add this to the documentation Page: MQTT Discovery - Home Assistant

Thanks for your help.

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