Alarmo: siren not turning on during trigger event

I set up Alarmo, and I get notifications by email when the alarm is triggered. But I cannot get my Honeywell siren to turn on on the trigger. (I can manually turn on siren in Home Assistant, btw, so it is connected.) I followed the tutorial on YouTube from JuanMTech but there is something missing from my YAML. I’m a newbie. Not sure how to solve this. Any hints are welcome.

You have not selected a target device or entity to turn on.

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