Airplay on a corporate network

I need to troubleshoot airplay issues on our network. We have about 20 Barcoo CSE-200 and 4 AppleTV, that are used for screen sharing in our meeting rooms.

All have Airplay enabled. The devices are on a separate VLAN/Network with no currently firewall between the users and the devices.

We tried the avahi reflector, which did not work so well and then used the Bonjour Gateway on a Cisco 3850.

It basically looks like this on the switch:

wireless multicast no wireless mdns-bridging service-list mdns-sd PERMIT-AIRPLAY-MDNS permit 10 match service-type _airplay._tcp.local ! service-list mdns-sd PERMIT-AIRPLAY-MDNS permit 20 match service-type _raop._tcp.local ! service-list mdns-sd GLOBAL-QUERY query service-type _airplay._tcp.local service-type _raop._tcp.local ! service-routing mdns-sd service-policy PERMIT-AIRPLAY-MDNS IN service-policy PERMIT-AIRPLAY-MDNS OUT service-policy-query GLOBAL-QUERY 60 interface Vlan2 ip address dhcp service-routing mdns-sd service-policy PERMIT-AIRPLAY-MDNS IN service-policy PERMIT-AIRPLAY-MDNS OUT redistribute mdns-sd ! interface Vlan3 ip address dhcp service-routing mdns-sd service-policy PERMIT-AIRPLAY-MDNS IN service-policy PERMIT-AIRPLAY-MDNS OUT redistribute mdns-sd ! 

This works fine if the user connected via a LAN cable. It takes 1-2 seconds until a Mac user can see the Airplay Icon. The Windows Users have Airparrot installed, which will list all rooms.

However, if the client is connected via our WiFi, the Mac users sometimes don't see any Airplay devices, if the see them they sometimes cannot connect to the devices. Or if they can connect, they loose the connection after some random amount of time.

The Windows User won't see any device via Airparrot. No matter what we tried, it did never work via WiFi for them.

We use a Cisco 5520 WLC and 2602,2702 and 2802 access points. The controller is not on prem, but in our data center. We use Flexconnect and dynamic VLAN assignment and a single SSID with 802.1x auth for all users.

Has anybody a working Airplay setup and wants to share their knowledge? I am out of ideas, why it's not working via WiFi properly.