It is common to see standard Infosec policy to prevent building larger Layer 2 flood domains in Enterprise. As a best practices this is primarily driven to support stringent security, network resiliency, end-point performance and other key factors.
In Enterprise, the Cisco Catalyst switches, Wireless can route the any Multicast DNS (mDNS) protocol based services such as AirPlay, ChromeCast, Printer and many more. The mDNS services can be routed across IP network without forklifting changes that needs restructuring and redesigning complete infrastructure.
You can recommend your Network IT team to refer following several documentations to enable Cisco Webex AirPlay across Enterprise: