I’ve been trying for yonks (>two full days, plus crashing HA along the way) to get duckdns to work on my home assistant, so that I can remote access it from my telephone. Without success. There are pages and pages of people trying to get it to work, with multiple suggestions, mostly without success. I then came across Tailscale, it took me all of ten minutes to set it up, and WORKING. Whow, so hope this helps anybody trying to get remote access to their home assistant. This is not a publicity for Tailscale or Duckdns, just I’m so pleased to get it finally working.
I haven’t had the same experience with DuckDNS. It was great for a few years, but for about the past year it would randomly go down (preventing access) or my domain would get flagged as spam. I ended up buying my own domain from cloudflare but I’m planning on investigating Tailscale at some point.