IKEA VINDSTYRKA Zigbee Air quality sensor

after updating to hassio 2023.10, the tvoc sensor created in this way:
sensors:
keittio_ilmanlaatu_tvoc:
friendly_name: “Keittiö ilmanlaatu TVOC”
icon_template: mdi:weather-dust
value_template: “”

and the automation suggested by @chendo give me back an error message

Any idea?

I am using ZHA with conbee 2