sudo apt intall stubby
Edit the file /etc/stubby/stubby.ytml.
Under the listen_addresses section change it to:
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: