@chassio did you ever get a response to this on any other support channels? I too am wondering why the Appliance Module is not detected when all my other RadioRA2 gear seems to be detected.
I am using a Ra2 Select Main repeater with the Lutron Casetta integration and it works great except for this missing plug.
@chassio v0.11.0 has merged into the dev branch of core. There’s been a release of core since it merged but I’m not sure if it was in the release. Not sure how to tell when it will be in a release.