In principle, no device that is registered with the HomePilot® is enabled for voice control. You must activate voice control for each individual device. Call up the device in the HomePilot app and open the configuration. In the device settings you will find the item "Voice control" Activate the service
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The device will be addressed with the actual name of the device. Therefore, please make sure that the names are unique. Names must not be assigned twice, otherwise Gooogle Assistant cannot distinguish the devices. Ultimately, you will have to test out which names are best suited in practice.