Alarm.com supports device authentication for Amazon Alexa. 

Note: Authenticating Two Factor with Alexa does not authenticate individual devices but authenticates the Amazon account to use Alarm.com.

To authenticate Amazon as a trusted account:

1. Enable the Alarm.com Skill. For more information, see Connect Amazon Alexa with Alarm.com.
2. Start talking to Alarm.com on the Amazon Echo device. Say “Alexa, talk to Alarm.com”.
3. Alexa will respond “This device has not been authenticated…” A text message or email with a six-digit code to authenticate the Amazon Alexa device will be sent.
4. To authenticate the device say: “Alexa, tell Alarm.com to authenticate with <code from text message or email>”.
5. If the code was not heard correctly by Alexa, try again. For best results, say each digit individually.
   • If Alexa is unable to understand the code, it is possible to retrieve a new code by starting the process over or saying: “Alexa, tell Alarm.com I need another code.”.
6. The Amazon account has now been authenticated to use Alarm.com.