Problems with Nextcloud CalDav and IOS

Hello!

For about 7 days now, the synchronization of calendar entries with our Nextcloud has been disrupted on iOS.

It works perfectly and without any issues on all other devices (Android and the desktop client). I can also add the Nextcloud calendar directly to the iOS Calendar app, and it works perfectly there as well. The problem is limited to the emclient on iOS.

Re-adding the calendar profile doesn’t change anything.

The entries are synced occasionally, but according to the sync processes, the calendar simply remains stuck in “Account properties are being synced” mode. I can’t see or find anything in the error log either.

Is this a known issue with iOS? Version 10.4.5360 (8677c88)—or how else can I generate/read logs myself?

Best regards