So this is a weird one. My current set up is:
- 3 x Apple TV 4K (Two on WiFi, one hardwired)
- All Apple TVs are on the IoT VLAN
- Our cellphones are on the Home VLAN
- mDNS is allowed between the VLANs
- Traffic from Home is allowed to IoT and return traffic is allowed
- All Apple TVs are listed in the screen mirror selection menu
- Two of the Apple TVs allow screen mirroring just fine
- One Apple TV will only accept screen mirroring if the iPhone is on the IoT VLAN
- My MacBook Air can screen mirror from the Home VLAN to the suspect TV no issue
- I have already factory reset the Apple TV and that did not resolve the issue.
- AirPlay is on, access is set to everyone, peer-to-peer wireless is on
Any help would be greatly appreciated. I think this is a network issue, but I'm also to seeking out some Apple specific assistance as well.
Source: r/applehelp · by /u/sneff30