Edit: Something fixed it. Only significant change I made is that I forwarded my 'A' record to the duckdns domain name. But I also reverted to an older version of DuckDNS (through a Snapshot) and got that working. Then I upgraded to latest and it was still able to create a cert. ...
NoIP，FreeDNS，ChangeIP，DuckDNS，XpertDNS，Strato，DynDNS.it，DtDNS，EasyDNS，DNS Made Easy，CloudF...