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Nextclould syncing calendar & contacts
iPhone
Nextcloud's offical docs state that it should be possible to sync iphone calendar/contacts using the base hostname via caldav/carddav.
In my experience, this has not been possible. Instead you must use this URL:
https://<fqdn-of-server>/remote.php/dav/principals/users/<username>/
Deails of be debugging this can be found here: https://help.nextcloud.com/t/how-to-add-nextcloud-calendar-to-iphone/64751/7