My understanding is that if a device includes a command in the device edit page, and has a capability that makes it available to select in RM capability listing (Refresh or Actuator are enough), then you should be able to run a command by selecting the "Set Mode, Variables or File, Run Custom Action", including the ability to pass in parameters. See screenshot below:
My problem - I realize now - is that I’m trying to run a device’s command from a device capability (Notification) that is not exposed to RM to use to run a custom command.
I’m using the “Notify Plus Tile Driver” that exposes a command (reset) that I’d like to call. It’s a refinement that I’d like to include in my Dashboard but I can live without it - not absolutely happy, but I’ll survive!