Busy information not available for additional (secondary) addresses

[matclab]

Steps to reproduce

1. create a user with primary address set to user.midle.name@exemple.com
2. add a secondary address umn@exemple.com
3. with another user, create an invitation and add those two addresses as attendee
4. in the busy view, informations are only available for primary user.midle.name@exemple.com address

Expected behavior

The busy information isavailable as well for primary and secondary addresses

Actual behaviour

Busy information is available ony for primary address

Calendar app version

4.3.1

CalDAV-clients used

Thunderbird, web-ui

Browser

Firefox 111.0.1

Client operating system

Arch linux

Server operating system

Hetzner share nextcloud

Web server

None

Database engine version

None

PHP engine version

None

Nextcloud version

25.0.3

Updated from an older installed version or fresh install

Updated from an older version

List of activated apps

Enabled:
  - activity: 2.17.0
  - apporder: 0.15.0
  - auto_groups: 1.5.1
  - bruteforcesettings: 2.5.0
  - calendar: 4.3.1
  - calendar_resource_management: 0.4.0
  - cloud_federation_api: 1.8.0
  - contacts: 5.2.0
  - contactsinteraction: 1.6.0
  - dashboard: 7.5.0
  - dav: 1.24.0
  - event_update_notification: 2.1.0
  - federatedfilesharing: 1.15.0
  - files: 1.20.1
  - files_external: 1.17.0
  - files_markdown: 2.3.6
  - files_readmemd: 2.0.0
  - files_rightclick: 1.4.0
  - files_texteditor: 2.15.0
  - files_versions: 1.18.0
  - firstrunwizard: 2.14.0
  - forms: 3.2.0
  - holiday_calendars: 0.2.1
  - logreader: 2.10.0
  - lookup_server_connector: 1.13.0
  - nextcloud_announcements: 1.14.0
  - notes: 4.7.2
  - notifications: 2.13.1
  - notify_push: 0.5.2
  - oauth2: 1.13.0
  - password_policy: 1.15.0
  - piwik: 0.11.1
  - privacy: 1.9.0
  - provisioning_api: 1.15.0
  - related_resources: 1.0.3
  - serverinfo_hetzner: 1.16.0
  - settings: 1.7.0
  - sharebymail: 1.15.0
  - support: 1.8.0
  - survey_client: 1.13.0
  - suspicious_login: 4.3.0
  - tasks: 0.14.5
  - text: 3.6.0
  - theming: 2.0.1
  - twofactor_backupcodes: 1.14.0
  - twofactor_totp: 7.0.0
  - updatenotification: 1.15.0
   - user_migration: 3.0.0
  - user_status: 1.5.0
  - viewer: 1.9.0
  - welcome: 1.0.8
  - workflowengine: 2.7.0
Disabled:
  - admin_audit
  - backup: 1.2.0
  - circles: 22.1.1
  - comments: 1.12.0
  - encryption
  - federation: 1.12.0
   - files_pdfviewer: 2.3.1
  - files_sharing: 1.14.0
  - files_trashbin: 1.12.0
  - photos: 1.4.0
   - recommendations: 1.1.0
  - systemtags: 1.12.0
  - user_ldap
   - weather_status: 1.2.0

Nextcloud configuration

not available in hetzner console

Web server error log

not available in hetzner console

Log file

not available in hetzner console

Browser log

No error in browser log

Additional info

No response

[ChristophWurst]

I think the dav backend is generally unaware of alternative emails.

[tcitworld]

Yeah, from what I can recall when working on nextcloud/server#31029, we don't map to a principal from alternative emails.