It is not possible to synchronize the calendar of the German provider WEB.DE (CALDAV) with eM client. In the program THUNDERBIRD it works without a problem if you specify the following path:
Has anyone ever successfully set up a WEB.DE calendar or can the support provide a how-to?
Es gelingt nicht den Kalender von WEB.DE (CALDAV) mit eM Client zu synchronisieren. Im Programm THUNDERBIRD funktioniert es ohne ein Probleme wenn man folgenden Pfad angibt:
If you’d like to synchronize a calendar, please go to Menu -> Tools -> Accounts -> New (the plus symbol) -> Calendar - CalDAV and fill in the path and the credentials.
I had the same problem with GMX.com/GMX.de. The CalDAV url that worked in Thunderbird did not work in eM Client. After some discussion with GMX and eM Client, a different url was found that worked.
You might want to check with web.de and see if there is something they can assist you with.