Thanks OE, but I suspect the problem here is the difference in networks between one node and the other.
The TV's Sling connection is initiated/controlled via a phone app, so I'm pretty sure the AIRTV2 device needs to be on the same net to be discoverable by the phone, not the TV.
SETUP INFO:
RT-AC88U (3.0.0.4.386_48260) connected to Frontier FIOS WAN -> RT-AC68U (3.0.0.4.386_51665) as AiMesh node under Ethernet connection & "backhaul".
Wireless router mode / AiMesh Router mode (Default)
An AIRTV2 OTA antenna feed device is attached to the RT-AC88U LAN via Ethernet.
We...