The desktop for eggPlant shouldn’t make a difference, but the desktop of the SUT could.
Are you able to send that key combination in Live Mode? (And produce the effect you are looking for).
This is just a guess, but with some desktops the placement of the mouse is important for certain events on the SUT (eg Sending the ScrollWheel). You might need to precede your TypeText with a MoveTo to make sure the mouse is where you expect it to be for that action.