Fixing ownCloud also worked for me, thank you.
Excuse me for bothering.
DAVx⁵ (formerly DAVdroid) 2.0 Release Notes
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Version 2.0.4
- resource detection: separate CalDAV/CardDAV detection
- resource detection: better handling of SocketTimeoutException
-
Version 2.0.5
- explicitly marked as compatible with Android 9
- minor bug fixes/improvements
-
Version 2.0.6
- ignore non-successful multiget responses
- library updates (including okhttp 3.12)
- switch to AndroidX (from Android support library)
- minor improvements
-
Version 2.0.7
- settings: added some icons, re-arranged entries
- ignore HTTP 403 when the resource upload fails because of missing permissions (server will win)
- debug info: show details about DAVdroid, contact/calendar providers and contact/calendar/task apps
- minor improvements and bug fixes
-
DAVx⁵ version 2.1
- rename DAVdroid to DAVx⁵ for legal reasons
- remove “Accounts may be gone after rebooting” startup dialog
- replace AmbilWarna by ColorPicker
- refactor Settings provider
- library updates
- minor improvements and bug fixes
-
Version 2.2
- greatly improved logging
- ask for contacts/calendar permissions as soon there is a known CalDAV/CardDAV service (fixes recurring permission notification)
- make sure the account is seen by OpenTasks
- retain sync intervals and isSyncable when renaming an account
- minor improvements and bug fixes
-
Version 2.2.1
- hotfix for Android 4.4: fix app crash when logging is enabled
- ical4j update (using built-in
EMAILparameter andCOLORproperty) - updated translations (including Farsi, thanks Taraneh Saei!)
-
Version 2.2.2
- login: show error message when account name is already taken
- use dav4jvm instead of dav4android (internal rename)
- fix crash on single-core devices
-
Version 2.2.3
- fix permissions/notification problem with OpenTasks
- maybe fix increased battery usage problem
- minor improvements and bug fixes
-
Version 2.2.3.1
- fix crash in debug info on some older devices when OpenTasks is not installed