New Victron 250/70 Visible Using Bluetooth but Not on VRM

Upgraded from 12V system and 100/50 Controller to 48V with 250/70. New controller is functioning properly according to local Bluetooth connection, but is not visible in VRM. Checked cable by supplying 12V to old controller and confirming that I see it in the VRM when switching the cable from the new controller to the old one. Firmware on Cerbo GX and new controller is current. Rebooted Cerbo GX to no avail. Next steps?