sudo apt intall stubby

Edit the file /etc/stubby/stubby.ytml.

Under the listen_addresses section change it to:

/etc/stubby/stubby.ytml

listen_addresses:
  - address_data: 127.0.0.1
    port: 5353
  - address_data: 0::1
    port: 5353

Also change:

round_robin_upstreams: 1

to

round_robin_upstreams: 0

Change the upstream_recursive_servers section to be what is shown in your account under NextDNS.

This is available under the Setup tab, and select Linux and then look for the Stubby section.

sudo systemctl restart stubby

In your Pi-hole instance, change your upstream DNS to 127.0.0.1#5353.

dig @<pi-hole_ip> www.google.com

where:

• <pi-hole_ip> is the IP address of the Pi-Hole server.