When there is installed PulseAudio and PipeWire at the same time and PulseAudio is enabled, during the installation the AudioInterface key in node.cfg is incorrectly set to 'pipewire'. As a consequence, after the installation, there is no audio in the NoMachine session.

Changing AudioInterface in node.cfg from pipewire to pulseaudio and then restart the NoMachine server fixes the problem. On v. 8.10, audio works correctly.