Hi all,
Since i have been struggling with this for days, I just briefly wanted to share that my 404 error was due to a wrong url given to me in integration setup. Manually adding port 8123 to the base duckdns.org url solved this
Stay safe all!
I also had this experience with my duckdns url, except that it gave me an “http response error 301”. Adding here so that people searching for that error code may stumble across this.