Pompousham

Hi, I'm an Unriad noob so please excuse me if this is a dumb question. I'm trying to enable remote access and encountering some issues. Port 443 on my server has a port forward for my NextCloud docker so I chose port 4443 as my HTTPS port and opened it up in my network. When try to provision a SSL Cert the whole page reloads after ~10 seconds and nothing happens. No error, no pop-up, absolutely nothing. I have SSL/TLS enabled as well. Anyone have an Idea what I'm doing wrong here?