Keyboard emulator with Arduino ProMicro

Hello guys,

I set up an Arduino Pro Micro as a game controller in SimHub, and I can see my buttons pressed/released in the controllers diagnostic window. But when I go to "keyboard emulation" to assign an action to a button press, the input isn't recognized, it only says "waiting for Input". "Controllers input" is enabled in the "available input plugins" window. Am I doing something wrong, or is keyboard emulation not possible with arduino pro micro within SimHub?