How to set up audio redirection - neutrinolabs/xrdp GitHub Wiki
There are currently two ways of using audio redirection on xrdp.
Using Pipewire
See https://github.com/neutrinolabs/pipewire-module-xrdp
On debian/ubuntu it is also available through apt:
sudo apt install pipewire-module-xrdp
If it doesn't seem to work after a restart, just make sure your window manager properly launches /usr/libexec/pipewire-module-xrdp/load_pw_modules.sh
when starting (using a mechanism specific to your window manager).
Using pulseaudio
https://github.com/neutrinolabs/pulseaudio-module-xrdp/wiki/README