NextDNS does not work many a times. I prefer the iOS app so that it’s easy to disable when needed, but the app has not been updated for a few years. Many a times the test page at test.nextdns.io will show as unconfigured and sometimes it will show as passing the test.

On Apple TV, I have the NextDNS profile installed, but it still doesn’t work.

Most of the community forum posts on NextDNS don’t get any answers. I’m sure the DNS servers exist, but the clients and the configuration options have not been supported by the creators.

I wouldn’t recommend NextDNS to anyone because of this apathy by its creators.