What version firmware and what type of device? I know there was talk of enabling a WAN3 port to support an extra WAN link, or MG devices for cell backup vs. the USB port cellular modems.
We have MX84's running 16.16, Z3's running a mix of 15.44 and 16.16.3. All of them only show WAN1, WAN2, and Cellular in insight WAN health. Here's hoping for a new feature to support WAN3 for large critical sites!
JG