Are you on 14.2? I've got 0.8.10, and it's working for me. It took a minute or so to pull data, but it's working, at least.
Although in the details tab, I noticed this message:
"Downloads
Weather data:
Last: 2019-02-05 21:48:02
Next: 2019-02-05 22:48:02
Current failed attempts: 0
Astronomical data:
Last: 2019-02-05 21:48:02
Next: 2019-02-06 21:48:02
Current failed attempts: 0
Met.no sunrise API states that this version of the webservice
is deprecated, and the plugin needs to be adapted to use
a newer version, or it will stop working within a few months.
Please file a bug on
https://bugzilla.xfce.org if no one
else has done so yet."