The PMDG 737-800 (738) radio stack can be a little confusing, in terms of the way the COM2 Radio works. The COM2 settings only work from the captain's side.
To receive on COM2: Turn on the VHF-2 volume knob on captain's (left) radio panel by simply clicking it. (The arrow on the knob should be pointing 5 o'clock position)
To transmit on COM2: Press corresponding MIC selector button on captain's (left) radio panel. (The selected button is backlit with orange light). The correct button is the one directly above VHF-2 knob, second to the left.
Both of those steps need to be done on captain's radio panel. However, frequencies can be changed from either panel.
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