[Bug]: LDAP mail attribute of users not updated in NextCloud data (primary email)

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

This is an identical issue as seen in #8304 which was closed, however the user's email address is not dupated despite adding mail to the Email Field special attribute in the LDAP advanced settings (as mentioned by @dphilly in #8304). Waiting a few days and/or running ldap:check-user --update <username> also doesn't show the email address or help here even though the mail field is set in Active Directory:

I ended up just setting the email manually on each user using LuXc-NL's method.

Steps to reproduce

1. Enter user in LDAP
   

2. First user login on Nextcloud
   

3. User notices that email is not set
   

4. User is adding primary email on ldap
   

5. Nextcloud does not updating the email attribute
   

Expected behavior

User email addresses that are in LDAP should be carried over to the users in Nextcloud.

Installation method

Community VM appliance

Nextcloud Server version

27

Operating system

Debian/Ubuntu

PHP engine version

PHP 8.2

Web server

Apache (supported)

Database engine version

PostgreSQL

Is this bug present after an update or on a fresh install?

None

Are you using the Nextcloud Server Encryption module?

None

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

{
    "system": {
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "localhost",
            "192.168.0.11",
            "nextcloud.empirenatgas.com",
            "nextcloud"
        ],
        "trusted_proxies": "***REMOVED SENSITIVE VALUE***",
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "pgsql",
        "version": "27.1.2.1",
        "overwrite.cli.url": "https:\/\/nextcloud.empirenatgas.com\/",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "upgrade.disable-web": true,
        "log_type": "file",
        "logfile": "\/var\/log\/nextcloud\/nextcloud.log",
        "loglevel": "2",
        "log.condition": {
            "apps": [
                "admin_audit"
            ]
        },
        "mail_smtpmode": "smtp",
        "remember_login_cookie_lifetime": "1800",
        "log_rotate_size": "10485760",
        "trashbin_retention_obligation": "auto, 60",
        "versions_retention_obligation": "auto, 180",
        "activity_expire_days": "120",
        "simpleSignUpLink.shown": false,
        "memcache.local": "\\OC\\Memcache\\Redis",
        "filelocking.enabled": true,
        "memcache.distributed": "\\OC\\Memcache\\Redis",
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "port": 0,
            "timeout": 0.5,
            "dbindex": 0,
            "password": "***REMOVED SENSITIVE VALUE***"
        },
        "default_phone_region": "us",
        "logtimezone": "US\/Eastern",
        "htaccess.RewriteBase": "\/",
        "maintenance": false,
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_sendmailmode": "smtp",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpsecure": "ssl",
        "mail_smtpauthtype": "LOGIN",
        "mail_smtpauth": 1,
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "465",
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
        "ldapProviderFactory": "OCA\\User_LDAP\\LDAPProviderFactory"
    }
}

List of activated Apps

Enabled:
  - activity: 2.19.0
  - admin_audit: 1.17.0
  - analytics: 4.11.0
  - analytics_sourcepack: 0.0.2
  - approval: 1.1.0
  - bookmarks: 13.1.1
  - bruteforcesettings: 2.7.0
  - calendar: 4.5.3
  - calendar_resource_management: 0.5.0
  - cloud_federation_api: 1.10.0
  - comments: 1.17.0
  - dashboard: 7.7.0
  - dav: 1.27.0
  - event_update_notification: 2.2.0
  - external: 5.2.1
  - federatedfilesharing: 1.17.0
  - files: 1.22.0
  - files_accesscontrol: 1.17.1
  - files_automatedtagging: 1.17.0
  - files_confidential: 2.0.1
  - files_external: 1.19.0
  - files_pdfviewer: 2.8.0
  - files_reminders: 1.0.0
  - files_retention: 1.16.0
  - files_rightclick: 1.6.0
  - files_sharing: 1.19.0
  - files_trashbin: 1.17.0
  - files_versions: 1.20.0
  - firstrunwizard: 2.16.0
  - impersonate: 1.14.0
  - logreader: 2.12.0
  - lookup_server_connector: 1.15.0
  - nextcloud_announcements: 1.16.0
  - notifications: 2.15.0
  - oauth2: 1.15.1
  - password_policy: 1.17.0
  - privacy: 1.11.0
  - provisioning_api: 1.17.0
  - recommendations: 1.6.0
  - related_resources: 1.2.0
  - richdocuments: 8.2.2
  - serverinfo: 1.17.0
  - settings: 1.9.0
  - sharebymail: 1.17.0
  - suspicious_login: 5.0.0
  - systemtags: 1.17.0
  - tasks: 0.15.0
  - text: 3.8.0
  - theming: 2.2.0
  - twofactor_backupcodes: 1.16.0
  - twofactor_totp: 9.0.0
  - updatenotification: 1.17.0
  - user_ldap: 1.17.0
  - viewer: 2.1.0
  - weather_status: 1.7.0
  - workflow_ocr: 1.27.5
  - workflowengine: 2.9.0
Disabled:
  - accessibility: 1.10.0
  - announcementcenter: 6.6.2 (installed 6.6.2)
  - apporder: 0.15.0 (installed 0.15.0)
  - circles: 27.0.1 (installed 22.1.1)
  - contacts: 5.4.2 (installed 5.4.2)
  - contactsinteraction: 1.8.0 (installed 1.5.0)
  - encryption: 2.15.0
  - extract: 1.3.6 (installed 1.3.6)
  - federation: 1.17.0 (installed 1.13.0)
  - files_fulltextsearch: 27.0.1 (installed 27.0.1)
  - files_videoplayer: 1.13.0
  - fulltextsearch: 27.0.2 (installed 27.0.2)
  - fulltextsearch_elasticsearch: 27.0.4 (installed 27.0.4)
  - mailnotifier: 0.0.3 (installed 0.0.3)
  - photos: 2.3.0 (installed 1.4.0)
  - richdocumentscode: 23.5.503 (installed 23.5.503)
  - support: 1.10.0 (installed 1.6.0)
  - survey_client: 1.15.0 (installed 1.11.0)
  - tables: 0.6.1 (installed 0.6.1)
  - user_status: 1.7.0 (installed 1.3.1)

Nextcloud Signing status

No errors have been found.

Nextcloud Logs

No response

Additional info

No response

Start in the user_ldap app and trace the ldap:check-user --update command and the LDAP email-field handling. Reproduce the flow by adding a mail attribute after first login, then verify that the Nextcloud primary email is updated without manual intervention.