Welcome to the community @Nella
I think the duckdns DNS servers may be down or having problems. I cannot query them either. Check their system status or just wait a while and see if it clears
I only tried 2 of the 9 auth servers but neither responded. Some of the other tools we use to check DNS could not reach them either.
dig A nellserv.duckdns.org @ns1.duckdns.org
;; communications error to 99.79.143.35#53: timed out
;; communications error to 99.79.143.35#53: timed out
;; communications error to 99.79.143.35#53: timed out
dig A nellserv.duckdns.org @ns2.duckdns.org
;; communications error to 35.182.183.211#53: timed out
;; communications error to 35.182.183.211#53: timed out
;; communications error to 35.182.183.211#53: timed out
Oddly, using https://unboundtest.com saw the correct A record (but did not run it numerous times).
dnsviz tests reported similar problems as above
