The Teensy 2.0 and the ++2.0 have different chips..! When I choose the AT90USB1286 for firmware and chip, everything worked! Still never got a COM port, or entered one... Not needed for Teensy..?
If I remember correctly is not need install COM port for Teensy, as is need for PRO Micro.
But you could write the firmware?
BTW - My Teensy 2.0 has ATMEGA32U4 mc, see in the picture (in il-2).
