Bosch Outdoor Siren

I do have a Bosch Outdoor Siren that supports ZigBee. I am trying to add it to Home Assistant, which I run using a ConBee II and ZHA.
I turned it on, and the DIP switch 8 is on (=“smart”). Some LED flashes which might indicate pairing mode, but I am not sure. In any case, it is not detected by HA.

There is an install code on a sticker in the case… not sure when and how I will use it during the installation process.

Does anybody have experience with this device, or a hint what to check?

Ok. Problem solved by calling the action zha.permit and entering the QR Code.