OpenWeatherChannel AirQuality Index - How to expose to HomeKit

Add-ons Bindings
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I am trying to expose the OpenWeatherChannel AirQuality Index as AirQuality Sensor to HomeKit.

All metadata are defined, from my perspective correctly, and the Sensor is visible in HomeKit.

However no data is transferred to HomeKit. All values are 0 or undefined.

OH Fehler 2
OH Fehler 21750×1596 222 KB

Any idea what the root cause of problem could be?