The qubes pipewire packages are installed by default in the debian 12 and Fedora 38 templates so long as you install the 4.2 versions from the official sources.
You linked my post from Demi. The pipewire service may need to be started as per the thread you linked.
The exact details of your problem I cant speak too, but I always find this post helpful. For some reason I always have audio trouble and this solves it for me.