It is necessary to link an Alarm.com-powered lamp or thermostat to your Alarm.com account before adding additional system components to Amazon Alexa. For additional information on how to add an Alarm.com powered light or thermostat to your Alarm.com account, go to the installation instructions that came with the item or get in touch with your dealer for help.
To add a device to the Smart Home skill:
pen the Amazon Alexa app.
Tap the below icon
Tap the "plus" icon.
Tap Add Device.
Tap Other.
Tap Discover Devices.
Alternatively, ask Alexa by saying, "Alexa, discover my devices."
Your newly named gadget ought to be within your control at this point. Check the Your Devices area of the Alexa app to make sure the device is listed if instructions are not causing a device action.