Android TV Open Plex ADB

Hi Guys. I use Node Red with Home Assistant but i dont think this is a Home Assistant issue and i am not getting anywhere on the forums to resolve. Hoping someone here could help.

I am. trying to Open Plex on my Amazon FireTV Cube. using the command {"command":"Home"} does take my Cube to the home screen. however using {"command":"Plex"} does nothing. Anyone have any ideas?

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