Yes, but only PF A, not PTT at the same time.
Also can you try pressing the button that is Macro 21 and talking into the remote device?
Any TX audio at the radio and does the radio go into transmit mode?
You have set menu #79 to 205 in the radio, right?
73 - Mark - K8MHW
'A RigPi Enthusiast!' - I am not otherwise affiliated with MFJ or RigPi