Syncing Nextcloud CardDAV/CalDAV for iOS failed


i was able to sync my Nextcloud calender and contacts to Mozilla Thunderbird via CardDAV and CalDAV. But every attemp to add a new calender or address book to my iOS 11.4 iPhone failed.

I tried the links like https://subdomain.domain.tld/remote.php/dav/principals/users/michael/ for CalDAV and CardDAV like described in the manual ( but it does not work.

Is this a known bug?

Thanks for your help.


Problem solved. It looks like it’s caused by the company wifi. Outside the office via mobile network both calenar and contacts can sync.