Before new system devices can be added to Amazon Alexa, it is required to add an Alarm.com powered light or thermostat to your Alarm.com account. See the installation instructions that came with the device or contact your dealer for support for more information about how to add an Alarm.com powered light or thermostat to your Alarm.com account.
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You should now be able to control your newly named device. If commands are not triggering a device action, check the Your Devices section of the Alexa app to confirm the device is listed.