i just tested with my no-ip account (i don't actually use it).
i used the "no-ip wizard" inside HFS, and got a
17.42.49 DNS update requested for 151.51.12.124: successful
can you help me reproducing the problem?
you could even privately send me your "url" (menu -> dynamic dns updater -> custom)
though it contains your password, you can change it after the problem has been solved.