First issue is that the self signed certificate installed by default points at example.com, which means you can’t browse to it in any decently modern browser, especially if HSTS is active.
Second issue is that even though I have a hostname which is set and working, the menu in SSL > Hostname SSL is blank, so I can’t issue an SSL for it. I also can’t create a site and issue a cert that way. Why isn’t it possible to simply enter the hostname manually, surely this would be more accurate.