PulseAudio routing is controlled by the resource class, that may be override by NEMO_RESOURCE_CLASS_OVERRIDE env. variable and then by /etc/pulse/xpolicy.conf config file. I have similar issue with navigation application. See https://github.com/mer-hybris/droid-hal-configs/pull/234 , Playing audio file with QMediaPlayer pause Media player - #4 by karry Try to add route_audio flag to some groups like call, ipcall… You can try to debug and manually update audio routing with some of the pactl commands…
What application is problematic for you?