Maybe there are some corrupt contacts that couldn’t be processed. You can try to replicate the problem when you turn on the extended logging in DAVx5. Then you can see if there are any problems. But basically here it works with iCloud…
DAVx⁵ 3.3 Release Notes
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DAVx⁵ 3.3
- accounts overview: show sync/refresh status of every account with a progress bar
- accounts overview: new Sync all accounts action
- launcher shortcut: Sync all accounts (available as DAVx⁵ has been started the first time); can be used as widget
- new debug info/share logs screen
- improved UI (including specific messages for common errors)
- improved debug info (more information, better readability)
- Share action now generates a ZIP file with debug info (and logs, if available)
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DAVx⁵ 3.3.1
- fix for Google Contacts / Android 11: export address book authenticator so that address books are shown in Google Contacts again
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DAVx⁵ 3.3.2
- support for tasks synchronization with Tasks app [not all fields, see comparison table]
- minor improvements, bug fixes, translations
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DAVx⁵ 3.3.3
- support for Android 11
- ask for permission to keep permissions in Permissions fragment
- handle background location permission for WiFi SSID restriction as required for Android 11
- declare requirements for package visibility
- login over Nextcloud app: use Login Flow v2 and Custom Tabs to support WebAuthn; so for instance 2FA with Yubikey is now supported
- minor improvements, bug fixes (including a big where OpenTasks was not shown in the permissions fragment when tasks.org was not installed), translation updates
- support for Android 11
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DAVx⁵ 3.3.4
- add Advanced Login that supports
- authentication with username/password and/or
- client certificates;
- or anonymous login
- fix “Empty values” exception when synchronizing changed contacts in vCard4-style groups
- add Advanced Login that supports
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DAVx⁵ 3.3.4.1
Sync algorithm: when uploading a locally modified resource results in 404/410, try as fresh upload again. Fixes some unnecessary 404 error messages.
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DAVx⁵ 3.3.5
- work around timezone problem of libical-based servers
- account setup: open account immediately after setup
- account settings: make password a password field
- don’t require location permissions for SSID access on Android <8
- add ICSx⁵ to visible packages so that it can be detected under Android 11
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DAVX⁵ 3.3.6
- when an account is created, open it immediately after setup
- don’t ask for active location services on Android <9 / location permissions on Android 8.0
- custom certificates: make it possible to trust different certificates with the same CN
- don’t sync Webcal-only calendars/tasks lists over CalDAV (may cause duplicate calendars)
- better Android 11 compatibility
- minor improvements and bug fixes
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DAVx⁵ 3.3.7
- account view: new setting “show only personal collections” (shows only collections from homesets, especially useful with for instance eGroupware)
- account view: show owner in collection properties (if available)
- allow to select client certificates for existing accounts
- save sync intervals and check/repair them at app start and reboot
- other improvements and bug fixes
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DAVx⁵ 3.3.8
- vCard nickname and Website URL: treat
TYPEvalue as case-insensitive - CalDAV: don’t show collections which are not calendars/task lists in the list
- BatchOperation: fix back references when the transaction has to be split multiple times
- debug info: include interface name and DNS servers
- minor improvements and bug fixes
- vCard nickname and Website URL: treat
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DAV⁵ 3.3.9
- new option: keep in foreground (may help when the device prevents automatic synchronization)
- AccountActivity: finish when account has been removed externally; don’t show “Create addressbook/calendar” when there’s no bind privilege on any homeset
- WebDAV service detection: save all information of homesets again
- debug info: show number of events, contacts, tasks for each account (to know whether sync is working)
