Duckdns installed but only works on http not https

Interesting… Just had to reload my Hassio as old one was becoming very unreliable and Duckdns installed perfectly first time, according to the log. However I can only get http not https connection! In the main log I get the following error when I try https:
Log Details (ERROR)
Thu Dec 27 2018 20:31:10 GMT+0000 (GMT)

Error handling request
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/aiohttp/web_protocol.py", line 242, in data_received
    messages, upgraded, tail = self._request_parser.feed_data(data)
  File "aiohttp/_http_parser.pyx", line 523, in aiohttp._http_parser.HttpParser.feed_data
aiohttp.http_exceptions.BadStatusLine: invalid HTTP method