CalDAV - Shared Calender invitation link not working

[blenkers]

Steps to reproduce

1. Create a calendar and share it with another user. Make it possible for this user to create events in that calender
2. login as 2nd user, create event on calender and invite other attendees. E-Mail gets send with Link for accepting to that user
3. click on the link in the invitation email. Error will be displayed. Only if event gets created in shared calendar and not for events created in private calendars

Expected behaviour

There should be a message saying "Event is updated", which happens if the event gets created not in the shared calendar but the private calendar

Actual behaviour

The invited person should be able to click on the link and the status should be updated. But instead an error gets displayed saying the invited person should contact the creator of the event.

Server configuration

Operating system:
debian 9.5
Web server:
nginx 1.10.3
Database:
mariadb Ver 15.1 Distrib 10.1.26-MariaDB
PHP version:
PHP 7.0.30-0+deb9u1 (php-fpm)
Nextcloud version: (see Nextcloud admin page)
14.0.3
Updated from an older Nextcloud/ownCloud or fresh install:
fresh install
Where did you install Nextcloud from:
original tar-all
Signing status:

Signing status

Login as admin user into your Nextcloud and access 
http://example.com/index.php/settings/integrity/failed 
paste the results here.

No errors have been found.
</details>

**List of activated apps:**
<details>
<summary>App list</summary>

Enabled:
  - accessibility: 1.0.1
  - activity: 2.7.0
  - admin_audit: 1.4.0
  - admin_notifications: 1.0.2
  - apporder: 0.5.0
  - bruteforcesettings: 1.2.0
  - calendar: 1.6.3
  - checksum: 0.4.1
  - cloud_federation_api: 0.0.1
  - comments: 1.4.0
  - contacts: 2.1.7
  - dav: 1.6.0
  - deck: 0.5.0
  - encryption: 2.2.0
  - federatedfilesharing: 1.4.0
  - federation: 1.4.0
  - files: 1.9.0
  - files_pdfviewer: 1.3.2
  - files_sharing: 1.6.2
  - files_texteditor: 2.6.0
  - files_trackdownloads: 1.3.1
  - files_trashbin: 1.4.1
  - files_versions: 1.7.1
  - firstrunwizard: 2.3.0
  - groupfolders: 1.3.3
  - logreader: 2.0.0
  - lookup_server_connector: 1.2.0
  - nextcloud_announcements: 1.3.0
  - notes: 2.4.2
  - notifications: 2.2.1
  - oauth2: 1.2.1
  - password_policy: 1.4.0
  - provisioning_api: 1.4.0
  - serverinfo: 1.4.0
  - support: 1.0.0
  - survey_client: 1.2.0
  - systemtags: 1.4.0
  - tasks: 0.9.7
  - theming: 1.5.0
  - twofactor_backupcodes: 1.3.1
  - updatenotification: 1.4.1
  - user_external: 0.4
  - workflowengine: 1.4.0
Disabled:
  - files_external
  - files_videoplayer
  - gallery
  - mail
  - sharebymail
  - user_ldap

Nextcloud configuration:

Config report

{
"system": {
"instanceid": "REMOVED SENSITIVE VALUE",
"passwordsalt": "REMOVED SENSITIVE VALUE",
"secret": "REMOVED SENSITIVE VALUE",
"trusted_domains": [
"REMOVED SENSITIVE VALUE"
],
"datadirectory": "REMOVED SENSITIVE VALUE",
"dbtype": "mysql",
"version": "14.0.3.0",
"overwrite.cli.url": "https://REMOVED SENSITIVE VALUE",
"dbname": "REMOVED SENSITIVE VALUE",
"dbhost": "REMOVED SENSITIVE VALUE",
"dbport": "",
"dbtableprefix": "oc_",
"dbuser": "REMOVED SENSITIVE VALUE",
"dbpassword": "REMOVED SENSITIVE VALUE",
"installed": true,
"default_language": "en",
"default_locale": "en_UK",
"mail_from_address": "REMOVED SENSITIVE VALUE",
"mail_smtpmode": "smtp",
"mail_domain": "REMOVED SENSITIVE VALUE",
"mail_smtphost": "REMOVED SENSITIVE VALUE",
"mail_smtpsecure": "ssl",
"mail_smtpport": "465",
"defaultapp": "calendar",
"auth.bruteforce.protection.enabled": true,
"user_backends": [
{
"class": "OC_User_IMAP",
"arguments": [
"{sensitive-data:993/imap/ssl/novalidate-cert}",
"sensitive-data"
]
}
],
"maintenance": false,
"mail_smtpauthtype": "LOGIN",
"mail_smtpauth": 1,
"mail_smtpname": "REMOVED SENSITIVE VALUE",
"mail_smtppassword": "REMOVED SENSITIVE VALUE"
}
}

Are you using external storage, if yes which one: local/smb/sftp/...

Are you using encryption: yes

Are you using an external user-backend, if yes which one: IMAP

With access to your command line run e.g.:
sudo -u www-data php occ ldap:show-config
from within your Nextcloud installation folder

  There are no commands defined in the "ldap" namespace.


Eventually replace sensitive data as the name/IP-address of your LDAP server or groups.

Client configuration

Browser:
Chrome, Firefox
Operating system:
Linux, Windows

Logs

Web server error log

Web server error log

none
Insert your webserver log here

Nextcloud log (data/nextcloud.log)

Nextcloud log

Insert your Nextcloud log here

Browser log

Browser log

Insert your browser log here, this could for example include:

a) The javascript console log
b) The network log
c) ...

[nextcloud-bot]

GitMate.io thinks possibly related issues are #8766 (Caldav ), #9605 (CalDav Issue, Calendar and Tasks not working), #10232 (Calender - all shares invalid?), #3830 (No calendar invitation send for event in shared calendars ), and #10797 (Invitations (attendees) not supported on shared calendars via macOS / iOS CalDAV clients).

[intelligentpotato]

I am also experiencing the same issue.
The error is:
There was an error updating your attendance status. Please contact the organizer directly.

I could not find any traces of it in nextcloud.log.

[vahem2lu]

Same error here. Also I see that some emails with invitations are sent, some not.

[coderkun]

Same issue here, same error message as @intelligentpotato and no entries in nextcloud.log.

[sandromario]

Same error here.

[wirepatch]

Same here, Current Nextcloud 14.04, calendar app 1.6.4. There is however a nextcloud.log entry:

"remoteAddr":"141.62.31.244","user":"--","app":"no app in context",
"method":"GET",
"url":"\/owncloud\/index.php\/apps\/dav\/invitation\/accept\/mpc57HLUk5pNYzGNGS5B8ySpC8R3a4Awp6lTWcmtA7uaakdYZzekjdZDlha2",
"message":"No cache entry found for \/appdata_oc85bf2bd50d\/theming\/images\/background (storage: local::\/opt\/nextcloud\/data\/, 
internalPath: appdata_oc85bf2bd50d\/theming\/images\/background)",
"userAgent":"Mozilla\/5.0 (X11; Linux x86_64) AppleWebKit\/537.36 (KHTML, like Gecko) Ubuntu Chromium\/70.0.3538.77 Chrome\/70.0.3538.77 Safari\/537.36","version":"14.0.4.2"}
{"reqId":"UUAbkY5JCablp0SIid0v","level":0,"time":"2018-11-29T17:24:13+00:00","remoteAddr":"141.62.31.244",
"user":"--","app":"no app in context","method":"GET","url":"\/owncloud\/index.php\/css\/icons\/icons-vars.css",
"message":"No cache entry found for \/appdata_oc85bf2bd50d\/css\/icons\/icons-vars.css.gzip (storage: local::\/opt\/nextcloud\/data\/, internalPath: appdata_oc85bf2bd50d\/css\/icons\/icons-vars.css.gzip)","userAgent":"Mozilla\/5.0 (X11; Linux x86_64) AppleWebKit\/537.36 (KHTML, like Gecko) Ubuntu Chromium\/70.0.3538.77 Chrome\/70.0.3538.77 Safari\/537.36","version":"14.0.4.2"}```

[boothb]

Exactly the same issue here with 14.04. But no log entries.

[Woosah]

Same bug with 14.04 and no log entries

[jvir]

apps/dav/lib/Controller/InvitationResponseController.php

On lines 82 and 105 $iTipMessage->getScheduleStatus() return '5.0' instead of '1.2' expected

'scheduleStatus' => '5.0;iTip message was not processed by the server, likely because we didn't understand it.'

[adlh]

I have the same problem with 15.0.0

[sschleic]

The same problem with 15.0.2