@Vincent-TP Nope, I can not see any AirPlay device over mDNS in a different VLAN, I tried restarting the Gateway a few times.

@Spanky66 Did you reboot the switch? I had most likely the same issue.

@Vincent-TP I've deleted the rules and tried to update the switch, but whyever I can not update it. It says updating but after a few minutes the controller just shows "Connected", with the same...

Already though the same

@Vincent-TP For the SG3428X-M2 V1.20.21 breaks the mDNS functionality. My Apple devices can't even see anymore the IoT devices.

@Julian2111 UPDATE: I noticed the camera did not automatically find the newest version (3.1.1) For everyone having the same issue just download the newest version here and update it locally...