I'm trying to use a virtual switch as well but not sure how to get it to show up.
One of the problems with the old
Virtual Switch plugin is that it creates devices with its own device type, rather than a Vera-native device type for a binary switch. As a result, it isn't recognized as equivalent in many places (another common place is in the Android mobile app, where the switches are listed but not controllable).
Virtual Switch has other problems, so I've just created a re-imagined 2019 implementation of virtual switches in a new plugin I call
Switchboard. It's not published in the Vera store yet, but you can get it here:
https://github.com/toggledbits/Switchboard-VeraI literally finished this thing a few minutes ago. Its switches may... SHOULD... work with Alexa, just like any other switch. I've already confirmed they work transparently in the Android app--full control.