I have entered the credentials from my provider, I get no connection errors using the CalDev configuration but none of my events are syncing.
I tried with 2FA off, using the caldav.soverin.net server with specific credentials, Error 405.

Setting up with https://caldav.soverin.net/calendars/us ... t/default/ puts the status as Ready, no errors or arguments but no events are syncing.
The above seems to be close but for some reason no sync occurs.