I have a Xiaomi Redmi 4X Device with Stock Android (no custom OS installation or modifications) I run a Radicale CalDAV Server at home and have installed the DAVDroid app (via F-Droid). Inside DAVDroid App, i have set up the connection to my CalDAV Server and DAVDroid shows up the calendar so the connection to the server is fine.
Problems occur when I want to use the calendar with the Calendar App on the Phone. In the calendar app I want (i.e. i have) to chose the CalDAV calendar as "calendar account" but the DAVDroid account is not showing up in the list of available calender accounts although it definitely exists.
(I did some other tests using the aCalDAV app from the google playstore and the aCalDAV account shows up and is working).
Is there maybe a problem that DAVDroid has becuse it does not have all the needed permissions? I have no idea how to resolve the issue so any hints are welcome!