Lights synced with the Amazon Alexa app can be controlled using many different commands. Below are some example commands for a light with the name Office Light.
The Alarm.com Smart Home skill does not support commands that ask for the status of your lights.
Example: “Alexa, is my Living Room Light on?” is not a supported command.
To control lights using the Smart Home skill, you must use the exact name of the light or group name as defined by Amazon Smart Home. This is different from the Alarm.com skill where you can give commands without mentioning a specific light.
For more information on group interactions, see Smart Home Skill - Group devices together in Amazon Alexa.