Ok, so this seems to be a third-party issue. Closing it now.
Is DAVdroid 0.8.0.0 apk available ?
I used 0.8.0.0 to access a Davical server and (maybe, I am not sure) I get a regression with last 0.9.1.2 : it does not find the calendar on davical. I want to load old 0.8.0.0 apk to cross check the problem.
Currently 0.8.0.0 davdroid on davical works well on another android client.
(It may be - but I am not sure - due to the fact that Well-known URLs are not configured on the davical on nginx server, but 0.8.0.0 client works fine on this server).
Where did you get DAVdroid 0.9.1.2 from?
from F-droid by clicking on https://f-droid.org/repo/at.bitfire.davdroid_86.apk
You may use the F-Droid Archive then.
No luck : it prposes only 0.8.1 to 0.8.3…
pierre at couderc.eu
@pcouderc If 0.8.1 doesn’t work, 0.8.0 won’t, too.
By the way, calender detection works quite well with DAViCal and current DAVdroid versions …