Alexa sees Leviton Lamp Dimmer Module as OFFLINE. Doesn't work via Alexa

I am able to control my Leviton DZPD3-2BW Decora Smart Plug-in Dimmer with Z-Wave Plus Technology from Smart Things Hub. I am able to get Alexa to discover it, but when she does, it is listed as Offline. I cannot control it with Alexa now matter what I do.