CalDAV and CardDAV broken on iOS


I am having issues adding the CalDAV and CardDAV services to my iOS devices running iOS 11.3.

These issues are consistent across two iOS devices. I was able to add them in Linux fine.

First I put in all the details provided by

(remaining screenshots are pending mod approval)


Then it attempts to verify them:

And then says it cannot connect via SSL and I try again without it:

Then that fails too.

I have tried using both my main password and a custom app password.

The same thing happens when using CardDAV: