So how to setup CalDAV with WEB.DE ?
Go to https://email@example.com using your webbrowser
Enter your email adress and your password in the upcoming dialogbox
Copy the link “Home Collection” at the bottom of the site
It should look like this:
Add new account in DAVdroid and use “Login with url and username”
For the Basis-URL use:
(!! Note !! that “/calendar” was added to the end of the link)
Enter username and password next.
After choosing and accepting an account name you should see “Mein Kalender” in the account.