File Picker with SAML user results in "Error: Invalid owner type" with User Migration app

Steps to reproduce

1. Setup SAML with NextCloud (difficult enough as it is)
2. Install User Migration app, then export a native NextCloud user.
3. Try to import the exported file via the same app on the SAML user, but fail to see any files (they load forever)

Expected behaviour

Realistically, when I open the file picker on a SAML user account, it should simply load and show all files that are present in the user's folder or folders they user has access to.

Actual behaviour

What happens instead is that, when opening the file picker on a SAML user account, it keeps on loading files indefinitely, with lots of errors being displayed in the Firefox console and also NextCloud logs (when set to Debug). This issue does not occur when using the file picker of a native NextCloud account, only with a SAML account. Refer to images below:

Native NextCloud account:

SAML account:

Server configuration

Operating system: Ubuntu 22.04 arm64

Web server: Apache2, NGINX as Reverse Proxy, Cloudflare as DNS & Firewall

Database: MySQL

PHP version: PHP 8.1.29 (cli) with FPM enabled

Nextcloud version: Nextcloud Hub 8 - 29.0.6

Where did you install Nextcloud from:
Community Projects - Web Installer

List of activated apps:

Enabled:
  - activity: 2.21.1
  - admin_audit: 1.19.0
  - announcementcenter: 6.8.1
  - bruteforcesettings: 2.9.0
  - calendar: 4.7.16
  - camerarawpreviews: 0.8.5
  - cfg_share_links: 5.1.2
  - checksum: 1.2.4
  - cloud_federation_api: 1.12.0
  - comments: 1.19.0
  - contacts: 6.0.0
  - contactsinteraction: 1.10.0
  - csp_editor: 1.6.0
  - dashboard: 7.9.0
  - dav: 1.30.1
  - deck: 1.13.1
  - drop_account: 2.6.0
  - epubviewer: 1.6.3
  - event_update_notification: 2.4.0
  - external: 5.4.0
  - federatedfilesharing: 1.19.0
  - federation: 1.19.0
  - files: 2.1.1
  - files_accesscontrol: 1.19.1
  - files_automatedtagging: 1.19.0
  - files_external: 1.21.0
  - files_pdfviewer: 2.10.0
  - files_reminders: 1.2.0
  - files_sharing: 1.21.0
  - files_snapshots: 1.0.10
  - files_trashbin: 1.19.0
  - files_versions: 1.22.0
  - files_zip: 1.6.0
  - firstrunwizard: 2.18.0
  - flow_notifications: 1.9.0
  - forms: 4.2.4
  - group_default_quota: 0.1.10
  - groupfolders: 17.0.3
  - impersonate: 1.16.0
  - integration_openai: 2.0.3
  - integration_replicate: 3.0.0
  - login_notes: 1.6.0
  - logreader: 2.14.0
  - lookup_server_connector: 1.17.0
  - metadata: 0.20.0
  - music: 2.0.0
  - notes: 4.10.1
  - notifications: 2.17.0
  - oauth2: 1.17.0
  - password_policy: 1.19.0
  - photos: 2.5.0
  - previewgenerator: 5.6.0
  - privacy: 1.13.0
  - provisioning_api: 1.19.0
  - quota_warning: 1.20.0
  - recommendations: 2.1.0
  - registration: 2.4.0
  - related_resources: 1.4.0
  - richdocuments: 8.4.6
  - root_cache_cleaner: 0.1.8
  - serverinfo: 1.19.0
  - settings: 1.12.0
  - sharebymail: 1.19.0
  - side_menu: 3.13.1
  - socialsharing_email: 3.1.0
  - suspicious_login: 7.0.0
  - systemtags: 1.19.0
  - terms_of_service: 2.5.0
  - theming: 2.4.0
  - twofactor_admin: 4.5.0
  - twofactor_backupcodes: 1.18.0
  - twofactor_nextcloud_notification: 3.9.0
  - twofactor_totp: 11.0.0-dev
  - twofactor_webauthn: 1.4.0
  - updatenotification: 1.19.1
  - user_migration: 6.0.0
  - user_saml: 6.2.0
  - user_status: 1.9.0
  - users_picker: 1.0.0
  - viewer: 2.3.0
  - weather_status: 1.9.0
  - workflowengine: 2.11.0
Disabled:
  - circles: 29.0.0-dev (installed 24.0.1)
  - encryption: 2.17.0
  - files_archive: 1.2.3 (installed 1.2.3)
  - files_downloadlimit: 2.0.0 (installed 1.1.0)
  - files_rightclick: 0.15.1 (installed 1.6.0)
  - nextcloud_announcements: 1.18.0 (installed 1.15.0)
  - support: 1.12.0 (installed 1.8.0)
  - survey_client: 1.17.0 (installed 1.14.0)
  - text: 3.10.1 (installed 3.6.0)
  - user_ldap: 1.20.0

Nextcloud configuration:

{
    "system": {
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": {
            "0": "localhost",
            "2": "cloud.REDACTED.xxx"
        },
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "skeletondirectory": "\/home\/sysadmin\/web\/cloud.REDACTED.xxx\/public_html\/data\/autocopy",
        "dbtype": "mysql",
        "version": "29.0.6.1",
        "default_phone_region": "KR",
        "overwrite.cli.url": "https:\/\/cloud.REDACTED.xxx\/",
        "overwriteprotocol": "https",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "mysql.utf8mb4": true,
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "memcache.local": "\\OC\\Memcache\\APCu",
        "distributed": "\\OC\\Memcache\\Redis",
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "filelocking.enabled": "true",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "port": 0,
            "timeout": 0
        },
        "mail_smtpmode": "smtp",
        "mail_smtpsecure": "tls",
        "mail_sendmailmode": "smtp",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpauthtype": "PLAIN",
        "mail_smtpauth": 1,
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "587",
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
        "maintenance": false,
        "htaccess.RewriteBase": "\/",
        "theme": "",
        "loglevel": 2,
        "app_install_overwrite": [
            "extract",
            "impersonate",
            "csp_editor",
            "files_archive",
            "files_rightclick"
        ],
        "twofactor_enforced": "true",
        "twofactor_enforced_groups": [],
        "twofactor_enforced_excluded_groups": [
            "2FA-EXCLUDE"
        ],
        "maintenance_window_start": 12
    }
}

Client configuration

Browser: Firefox 130.0

Operating system: Windows 11 Pro

Logs

Nextcloud log (data/owncloud.log)

nextcloud.log

Browser log

Error: Invalid owner type
    k index.mjs:558
    S index.mjs:602
    F index.mjs:811
    R index.mjs:887
    l FilePicker-DBGB1Rec.mjs:797
    p FilePicker-DBGB1Rec.mjs:825
[vue.runtime.esm.js:3065:16](webpack:///user_migration/node_modules/vue/dist/vue.runtime.esm.js)
    VueJS 4
        hn
        dn
        un
        cn
Error: Invalid owner type
    k index.mjs:558
    S index.mjs:602
    F index.mjs:811
    R index.mjs:887
    l FilePicker-DBGB1Rec.mjs:797
    p FilePicker-DBGB1Rec.mjs:825
[vue.runtime.esm.js:3065:16](webpack:///user_migration/node_modules/vue/dist/vue.runtime.esm.js)
    VueJS 4
        hn
        dn
        un
        cn
[ERROR] user_migration: Error selecting file to import: FilePicker: No nodes selected 
Object { app: "user_migration", uid: "7", level: 0, error: Error }
[ConsoleLogger.js:74:18](webpack:///user_migration/node_modules/@nextcloud/logger/dist/ConsoleLogger.js)
    value ConsoleLogger.js:74
    value ConsoleLogger.js:100
    pickImportFile ImportSection.vue:208

Reproduce the file-picker failure with a SAML account and the User Migration app, then start with the browser stack trace and user_migration's ImportSection.vue at pickImportFile. Compare the failing SAML account with a native account and use the linked Nextcloud log to trace the “Invalid owner type” result. Done means the picker loads selectable files and the import can proceed for SAML users.