From our end, that domain has no name servers and doesn’t resolve to anything, it’s an issue with freenom. They are infamous for canceling websites that get too much traffic and then trying to extort money from you, this is usually the symptom of that happening.
This is a major reason we highly recommend users stay away from them these days.
i’ll take a look at the IP issue when I get a moment. Can you post the public IP address of the connection that doesn’t work?