MP 1,1-5,1 cMP 5,1 Monterey AirPlay System Audio Not Finding shairport-sync Receiver

[KittyComputer]

Hey All.
The issue I'm having on my 5,1 cMP is my shairport-sync receiver isn't showing up in system audio like it does on my MacBook Air 7,1. However the Apple Music app on my cMP can connect to shairport-sync just fine.

Here's it working as expected on my MacBook Air

Device isn't found in System Prefs on cMP

Device IS found only in Apple Music on cMP

OC config.plist added just for good measure.
Thanks!