@johnpoz I think I do have the VLANs setup and traffic working between them. I can ping back and forth etc. Workstations can access the internet. Workstations can print to the printer (although they can't auto discover it). Things are failing when I want to cast from a phone to a smart tv. Right now we have to use the "enter a code" method to connect to the TV instead of being able to discover it and connect to it more easily.
I'm specifically looking for the YouTube app to work for device discovery when casting.
I'm using a Pixel 5 and my wife is using an iPhone XR. The TV in question is a Sony Bravia running Android OS.
From the videos and reading i've found, Avahi is supposed to help enable this (unless i'm misunderstanding something).