Hi @JimmyKater!
Thanks again for your support over here!
Oddly enough, I have retried the solution prescribed by @Bernie_O on Why doesn't calendar sync to iOS work?, and this time it has worked! (Apparently I’m not the only one to have tried a few times before getting it right. Maybe the server needs some time to update to the new .htaccess settings?)
Hopefully it will keep on working!
——
The solution is the following:
Check if service-discovery is working: visit with a browser https://cloud.myserver.com/.well-known/caldav
This should redirect you to the webdav interface and after entering user credentials you should see “This is the WebDAV interface. It can only be accessed by WebDAV clients such as the Nextcloud desktop sync client.”
If this is working, do that on the iOS device:
Settings -> “accounts+passwords” -> “add account” -> “other” -> “add caldav account”
As server enter only the domain name nothing else (in your example this would be “cloud.myserver.com ”). Also enter username and password for the nextcloud user and hit “proceed” in the upper right corner.
With working service-discovera iOS will automatically discover the proper url. Letsencrypt is no problem for iOS - it works here without any issues for the last year or so.