Pyfirmata and Teensy 3.6

[Kay]

Hello everyone,

I am trying to use pyfirmata with the Teensy 3.6. I am struggling with the dictionary for this board, in particular for its two DAC pins (A21 and A22). This is what I have so far:

teensy36 = {
    'digital' : tuple(x for x in range(40)),
    'analog' : tuple(x for x in range(23)),
    'pwm' : (2,3,4,5,6,7,8,9,10,14,16,17,20,21,22,23,29,30,35,36,37,38), // I know this can be done more elegantly :)
    'use_ports' : True,
    'disabled' : (0, 1) # Rx, Tx, Crystal
}
board = fm.Arduino('COM5')
board.setup_layout(teensy36)

Problem is, I can't write to the two DAC pins. It either tells me that they are inputs, not outputs, or, if I force them to be outputs, the output voltage doesn't change, no matter the .write() value.

What am I missing?
Thanks!