OS: Ubuntu 22.04

NextDNS configuration as recommended for systemd-resolved.

After enabling DNSSEC=yes in '/etc/systemd/resolved.conf':

1. Web browser (https://my.nextdns.io): unable to check status

2. $ ping test.nextdns.io
   ping: test.nextdns.io: Name or service not known

3. $ resolvectl query test.nextdns.io
   test.nextdns.io: resolve call failed: DNSSEC validation failed: no-signature

With other sites currently there is no problem (e.g. nextdns.io).

Is it due to incorrect server (test.nextdns.io) configuration?