Can Nextcloud Calendar act as a client for an authenticated external CalDAV server?

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Hello everyone,

I am currently evaluating a calendar integration scenario and would like to understand whether this is supported by Nextcloud Calendar or if I am approaching it the wrong way.

Environment

  • Nextcloud Hub 10 (latest stable)
  • Calendar app (latest version)
  • Exchange Online
  • Sendent Exchange Connector
  • External application providing a standard CalDAV server (SabreDAV)

The external application is not Nextcloud. It exposes a fully authenticated CalDAV server.

What I verified

Using a WebDAV browser, I can successfully access the server.

Authentication works correctly.

The server exposes standard CalDAV properties such as:

  • calendar-home-set
  • calendar-user-address-set
  • current-user-principal
  • ACLs
  • VEVENT resources

Each calendar event is stored as a standard RFC5545 .ics file.

Example:



BEGIN:VCALENDAR
VERSION:2.0
BEGIN:VEVENT
UID:...
DTSTART...
DTEND...
SUMMARY...
DESCRIPTION...
END:VEVENT
END:VCALENDAR

So I believe the remote server is a fully standards-compliant CalDAV implementation (SabreDAV).

What I tried

Inside Nextcloud Calendar I selected:

New calendar → Subscribe from link

and entered the authenticated CalDAV URL.

The calendar was created, but

  • I was never asked for username/password
  • no events appeared
  • synchronization never happened

My question

Is Nextcloud Calendar able to connect to an authenticated external CalDAV server as a CalDAV client, or is the “Subscribe from link” feature only intended for public ICS subscriptions?

If external authenticated CalDAV accounts are not supported, is there:

  • any official app,
  • roadmap,
  • or recommended solution

to synchronize an external CalDAV server with a Nextcloud calendar?

Our goal is to keep Nextcloud as the central collaboration platform while integrating calendars from third-party applications exposing standard CalDAV.

Any clarification from the developers or community would be greatly appreciated.

Thank you!

2

This feature was introduced in Nextcloud Hub 26 / Nextcloud 34. Announcement:

We enabled full read-write support for external CalCAV and CardDAV, adding an ability to connect external calendars and address books to yours respectively.

Source: Nextcloud Hub 26 Spring: Built together, designed for the future - Nextcloud

I have never tested this. But afaik, you need to install the following official app for that: