Thought I'd offer a quick update: In case anyone tries to recreate, thus far narrowed it down to creating and enabling a Guest Network Pro (Guest Network) profile. Once created, 2.4 and 5 Ghz 0r 2.4, 5 and 6GHz, WPA2 or WPA2/WPA3, VLAN 66, 225.225.225.240, DHCP Sever enabled, 192.168.66.1...