Could you please check that the IP address has been updated properly? You can run dig fbwr.freedombox.rocks on any machine to see the IP address assigned to that domain. Then you can run curl ipinfo.io to retrieve the IP address that has been assigned to you by your ISP. They should both match.
If your ISP gives you a public IP address, then you need to ensure that your home router forwards incoming traffic to FreedomBox. This is typically done by logging into the router, and configuring DMZ ip address as FreedomBox IP address (after making a reservation for that IP address).
If your ISP doesn’t give you a public IP address, you can’t use Dynamic DNS. You need to use one of workaround techniques such as Pagekite or Tor hidden service to reach your FreedomBox from outside.
Could you please confirm with your ISP (or by searching online) which is the case?
If you are doing all of your testing at home on your LAN, you may get different results if you try to hit your public IP address away from home. At least I have found this.
Another way to test: Install Tor browser, get it up and running, and then enter your current IP address (e.g. https://220.127.116.11 or whatever) into the Tor browser address field. The reason this might work is that you’ll be coming at your public IP via the Tor relay circuit even though you initiate the request from inside your home network.
Note 1: Since your public IP is probably being changed at will by your ISP, make sure to get its current value before testing.
Note 2: If you get stuck and need more time to get dynamic DNS working, you can also try pagekite as an alternative. Yet another alternative is to start up the Tor hidden service on FreedomBox and, temporarily, access your service via the onion address.
Now I tried it with my smartphone (a fairphone) and with mobil data and voila, I reached my freedombox. I think the problem is solved. Key was, that I had to find a way, to reach the freedombox from outside my home nethwork.
Since I was not able to get a response from https://fbwr.freedombox.rocks/, I wonder if it is working for you? If not, then check if your public IP address is getting updated in GnuDip.
If you do not find the correct IP, then you can manually update there based on what you’ve gotten from your router. It may take some minutes to propagate this new value, as I understand it, so you may have to wait a bit.
Also if you are friendly with Tor, then setting up the Tor hidden service on FreedomBox may still be a great way to go. It provides you an onion address independent of DNS.