I self host a bunch of things on my home network and since i dont have a static ip i use duckdns so i can access it via the greater web and set up ssl etc. Works great for my laptop and other people but on my phone where im using rethink dns to filter web access the duckdns domain doeant resolve (its not getting blocked it just not resolving at all). It resolves on cloudflare and ive set that as the fallback for rethink but still doesnt resolve any advice/help would be greatly appreciated.
I recently began running my own recursive dns server for personal use and have noticed that duckdns isn’t super stable. Domains on there regularly fail to resolve with the name servers unreachable.
You should consider switching your dns provider. One option is to buy your own domain and setup dyndns with some provider, Cloudflare has a good guide for that.