Vpilot Tx button greyed out

Hi there. Iv loaded up vpilot for a flight and my Tx button is greyed out. I have a microphone setting selected, push to talk is reconfigured, Iv tried running vpilot as admin and all my avionics are on

Is the avionics in the aircraft switched on, and the radio mic selector set up correctly? While not a 100% accurate rendition, correct use of the radios matter.