Transponder won't say on

I working with Alabeo M20R_Ovation_v1.3 plane.  The Reality XP GTN 750 transponder does not stay on.  It seems to work on default planes.  

Any idea what sort of tweak I may have to make to have this function?

Really need it for Pilot Edge, especially because I own a Mooney and spent big bucks building a physical replica of my own panel which has GTN750.