MQTT sensor not in list | Home Assistant | Page 1

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Hello everyone!
I'm trying to convert my already existing solution to monitor the level of the pellets from a standalone platform to Home Assistant.
My "sensor" device is a Raspbian Raspberry Pi Zero W and it publishes the percentage of the "pellet tray" on pellets/metrics/percentage.
I have Home Assistant Container installed on my Raspberry PI 4.

Here's the part of the configuration.yaml file:

mqtt:
  sensor:
    - name: "Pellets Percentage"
      unique_id: "pellets_percentage"
      state_topic: "pellets/metrics/percentage"
      unit_of_measurement: "%"
      availability:
        - topic: "pellets/status"
      payload_available: "Online"
      payload_not_available: "Offline"

Why it isn't shown in anything?

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The LWT works as intended:

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Messaggio 0 ricevuto su pellets/status alle 1:19:
Online

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And the percentage too:

Messaggio 1 ricevuto su pellets/metrics/percentage alle 1:20:
98.94915254237287

#MQTT sensor not in list