The Insteon 2412U PLM handles X10 as well Insteon so you have the correct unit and can use both, plus ZigBee devices from the built in radio in the P2. Have you enabled the Smartenit Skill in your Alexa App? Also check that you have the latest firmware which, at this point, is 3.15.0-14. If the Alexa skill is enabled already then let me know and we'll go from there. When I discovered devices with the skill enabled they worked right away with commands like "Alexa, turn on office lamps."