NextDNS is not working on the Ubiquiti UGC Ultra

I have UGC Ultra. I've follow the directions on Git Hub https://github.com/nextdns/nextdns/wiki/UnifiOS

All the CLI commands work and status from the CLI says NextDNS is running. Yet, my devices connected to the network still report Cloudflare as the DNS resolver. There are other options to set preferred or manual DNS in UnifiOS. Is the CLI the right approach? The iOS Profile/Client works fine. I don't want to have to install a NextDNS profile or client on every device.