Sharing folder with federated team throws exception and fails to sync to remote instance

[cristianscheid]

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When sharing a folder with a federated team that includes members from a remote (federated) instance, the share creation throws an OC\User\NoUserException (Backends provided no user object). As a result, the shared folder does not appear for the remote member under "All files" or "Shared with you" on their instance.

Steps to reproduce

1. setup a federation environment with two NC instances

• used haze to setup the environment
  • instance one: https://maiden-ant.haze.127.0.0.1.sslip.io
  • instance two: https://noted-trunkfish.haze.127.0.0.1.sslip.io
• make sure both instances are up and running and can reach each other
• on each instance, under "Administration settings > Sharing > Trusted servers":
  • add other instance URL and click +
  • run cron jobs a few times until ✔ appears on left of added URL
• on each instance, under "Administration settings > Sharing > Federated Teams":
  • toggle "Enable federated teams"
  • enter URL of the current instance (e.g. if you are on instance-one, insert "https://instance-one/")
• on each instance, run the following command:

occ circles:remote

• you should see something like:

$ haze haze-maiden-ant occ circles:remote
+-----------------------------------------+----------+---------+--------------------+--------------------+---------+
| Instance                                | Type     | iface   | UID                | Authed             | Aliases |
+-----------------------------------------+----------+---------+--------------------+--------------------+---------+
| noted-trunkfish.haze.127.0.0.1.sslip.io | External | frontal | 9bbe870bcb34c53355 | 9bbe870bcb34c53355 | []      |
+-----------------------------------------+----------+---------+--------------------+--------------------+---------+

$ haze haze-noted-trunkfish occ circles:remote
+------------------------------------+----------+---------+--------------------+--------------------+---------+
| Instance                           | Type     | iface   | UID                | Authed             | Aliases |
+------------------------------------+----------+---------+--------------------+--------------------+---------+
| maiden-ant.haze.127.0.0.1.sslip.io | External | frontal | bb1a701b508ff5facf | bb1a701b508ff5facf | []      |
+------------------------------------+----------+---------+--------------------+--------------------+---------+

2. create a federated team on instance one

• as bob, created federated_team
• under team settings, checked "Allow federated members"
• added john from instance two

3. share a folder from instance one with the federated team:

• as bob, created test_folder and shared it with federated_team

• sharing with federated_team throws an exception [1]
• on frontend, no message error is shown, and it shows that the folder is shared with federated_team

4. check if the shared folder appears on instance two:

• as john, refreshed the page
• test_folder does not appear under "All files" or "Shared with you"

Expected behaviour

When sharing test_folder with federated_team, the share should complete without errors, and test_folder should appear for john on instance two, under "Shared with you".

Actual behaviour

Sharing test_folder with federated_team throws an exception [1]. After refreshing the page as john on instance two, test_folder does not appear under "All files" or "Shared with you".

[1] Exception thrown when sharing test_folder with federated_team:

{
    "reqId": "AMwW4by1YjOYMDacHFvE",
    "level": 3,
    "time": "2026-08-14T19:31:12+00:00",
    "remoteAddr": "172.20.0.1",
    "user": "bob",
    "app": "files",
    "method": "POST",
    "url": "/ocs/v2.php/apps/files_sharing/api/v1/shares",
    "scriptName": "/ocs/v2.php",
    "message": "Backends provided no user object for john",
    "userAgent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/151.0.0.0 Safari/537.36",
    "version": "35.0.0.3",
    "exception": {
        "Exception": "OC\\User\\NoUserException",
        "Message": "Backends provided no user object",
        "Code": 0,
        "Trace": [
            {
                "function": "getUserFolder",
                "class": "OC\\Files\\Node\\Root",
                "type": "->",
                "args": [
                    "john"
                ]
            },
            {
                "file": "/var/www/html/lib/private/Files/Node/LazyFolder.php",
                "line": 67,
                "function": "call_user_func_array",
                "args": [
                    [
                        {
                            "__class__": "OC\\Files\\Node\\Root"
                        },
                        "getUserFolder"
                    ],
                    [
                        "john"
                    ]
                ]
            },
            {
                "file": "/var/www/html/lib/private/Files/Node/LazyRoot.php",
                "line": 41,
                "function": "__call",
                "class": "OC\\Files\\Node\\LazyFolder",
                "type": "->",
                "args": [
                    "getUserFolder",
                    [
                        "john"
                    ]
                ]
            },
            {
                "file": "/var/www/html/apps/files_sharing/lib/ShareTargetValidator.php",
                "line": 70,
                "function": "getUserFolder",
                "class": "OC\\Files\\Node\\LazyRoot",
                "type": "->",
                "args": [
                    "john"
                ]
            },
            {
                "file": "/var/www/html/apps/files_sharing/lib/ShareRecipientUpdater.php",
                "line": 77,
                "function": "verifyMountPoint",
                "class": "OCA\\Files_Sharing\\ShareTargetValidator",
                "type": "->",
                "args": [
                    "*** sensitive parameters replaced ***",
                    "*** sensitive parameters replaced ***",
                    {
                        "__class__": "Closure"
                    },
                    [
                        "*** sensitive parameters replaced ***"
                    ]
                ]
            },
            {
                "file": "/var/www/html/apps/files_sharing/lib/Listener/SharesUpdatedListener.php",
                "line": 99,
                "function": "updateForAddedShare",
                "class": "OCA\\Files_Sharing\\ShareRecipientUpdater",
                "type": "->",
                "args": [
                    "*** sensitive parameters replaced ***"
                ]
            },
            {
                "file": "/var/www/html/apps/files_sharing/lib/Listener/SharesUpdatedListener.php",
                "line": 140,
                "function": "{closure:OCA\\Files_Sharing\\Listener\\SharesUpdatedListener::handle():98}",
                "class": "OCA\\Files_Sharing\\Listener\\SharesUpdatedListener",
                "type": "->",
                "args": [
                    "*** sensitive parameters replaced ***"
                ]
            },
            {
                "file": "/var/www/html/apps/files_sharing/lib/Listener/SharesUpdatedListener.php",
                "line": 98,
                "function": "markOrRun",
                "class": "OCA\\Files_Sharing\\Listener\\SharesUpdatedListener",
                "type": "->",
                "args": [
                    "*** sensitive parameters replaced ***",
                    {
                        "__class__": "Closure"
                    }
                ]
            },
            {
                "file": "/var/www/html/lib/private/EventDispatcher/ServiceEventListener.php",
                "line": 57,
                "function": "handle",
                "class": "OCA\\Files_Sharing\\Listener\\SharesUpdatedListener",
                "type": "->",
                "args": [
                    {
                        "__class__": "OCP\\Share\\Events\\ShareCreatedEvent"
                    }
                ]
            },
            {
                "file": "/var/www/html/3rdparty/symfony/event-dispatcher/EventDispatcher.php",
                "line": 206,
                "function": "__invoke",
                "class": "OC\\EventDispatcher\\ServiceEventListener",
                "type": "->",
                "args": [
                    {
                        "__class__": "OCP\\Share\\Events\\ShareCreatedEvent"
                    },
                    "OCP\\Share\\Events\\ShareCreatedEvent",
                    {
                        "__class__": "Symfony\\Component\\EventDispatcher\\EventDispatcher"
                    }
                ]
            },
            {
                "file": "/var/www/html/3rdparty/symfony/event-dispatcher/EventDispatcher.php",
                "line": 56,
                "function": "callListeners",
                "class": "Symfony\\Component\\EventDispatcher\\EventDispatcher",
                "type": "->",
                "args": [
                    [
                        {
                            "__class__": "Closure"
                        },
                        {
                            "__class__": "Closure"
                        },
                        {
                            "__class__": "Closure"
                        },
                        {
                            "__class__": "Closure"
                        },
                        {
                            "__class__": "Closure"
                        },
                        "And 3 more entries, set log level to debug to see all entries"
                    ],
                    "OCP\\Share\\Events\\ShareCreatedEvent",
                    {
                        "__class__": "OCP\\Share\\Events\\ShareCreatedEvent"
                    }
                ]
            },
            {
                "file": "/var/www/html/lib/private/EventDispatcher/EventDispatcher.php",
                "line": 74,
                "function": "dispatch",
                "class": "Symfony\\Component\\EventDispatcher\\EventDispatcher",
                "type": "->",
                "args": [
                    {
                        "__class__": "OCP\\Share\\Events\\ShareCreatedEvent"
                    },
                    "OCP\\Share\\Events\\ShareCreatedEvent"
                ]
            },
            {
                "file": "/var/www/html/lib/private/EventDispatcher/EventDispatcher.php",
                "line": 87,
                "function": "dispatch",
                "class": "OC\\EventDispatcher\\EventDispatcher",
                "type": "->",
                "args": [
                    "OCP\\Share\\Events\\ShareCreatedEvent",
                    {
                        "__class__": "OCP\\Share\\Events\\ShareCreatedEvent"
                    }
                ]
            },
            {
                "file": "/var/www/html/lib/private/Share20/Manager.php",
                "line": 1909,
                "function": "dispatchTyped",
                "class": "OC\\EventDispatcher\\EventDispatcher",
                "type": "->",
                "args": [
                    {
                        "__class__": "OCP\\Share\\Events\\ShareCreatedEvent"
                    }
                ]
            },
            {
                "file": "/var/www/html/lib/private/Share20/Manager.php",
                "line": 638,
                "function": "dispatchEvent",
                "class": "OC\\Share20\\Manager",
                "type": "->",
                "args": [
                    {
                        "__class__": "OCP\\Share\\Events\\ShareCreatedEvent"
                    },
                    "share created"
                ]
            },
            {
                "file": "/var/www/html/apps/files_sharing/lib/Controller/ShareAPIController.php",
                "line": 813,
                "function": "createShare",
                "class": "OC\\Share20\\Manager",
                "type": "->",
                "args": [
                    "*** sensitive parameters replaced ***"
                ]
            },
            {
                "file": "/var/www/html/lib/private/AppFramework/Http/Dispatcher.php",
                "line": 172,
                "function": "createShare",
                "class": "OCA\\Files_Sharing\\Controller\\ShareAPIController",
                "type": "->",
                "args": [
                    "*** sensitive parameters replaced ***"
                ]
            },
            {
                "file": "/var/www/html/lib/private/AppFramework/Http/Dispatcher.php",
                "line": 80,
                "function": "executeController",
                "class": "OC\\AppFramework\\Http\\Dispatcher",
                "type": "->",
                "args": [
                    {
                        "__class__": "OCA\\Files_Sharing\\Controller\\ShareAPIController"
                    },
                    "createShare"
                ]
            },
            {
                "file": "/var/www/html/lib/private/AppFramework/App.php",
                "line": 138,
                "function": "dispatch",
                "class": "OC\\AppFramework\\Http\\Dispatcher",
                "type": "->",
                "args": [
                    {
                        "__class__": "OCA\\Files_Sharing\\Controller\\ShareAPIController"
                    },
                    "createShare"
                ]
            },
            {
                "file": "/var/www/html/lib/private/Route/Router.php",
                "line": 324,
                "function": "main",
                "class": "OC\\AppFramework\\App",
                "type": "::",
                "args": [
                    "OCA\\Files_Sharing\\Controller\\ShareAPIController",
                    "createShare",
                    {
                        "__class__": "OC\\AppFramework\\DependencyInjection\\DIContainer"
                    },
                    {
                        "_route": "ocs.files_sharing.shareapi.createshare"
                    }
                ]
            },
            {
                "file": "/var/www/html/ocs/v1.php",
                "line": 78,
                "function": "match",
                "class": "OC\\Route\\Router",
                "type": "->",
                "args": [
                    "/ocsapp/apps/files_sharing/api/v1/shares"
                ]
            },
            {
                "file": "/var/www/html/ocs/v2.php",
                "line": 10,
                "args": [
                    "/var/www/html/ocs/v1.php"
                ],
                "function": "require_once"
            }
        ],
        "File": "/var/www/html/lib/private/Files/Node/Root.php",
        "Line": 325,
        "message": "Backends provided no user object for john",
        "exception": "{\"class\":\"OC\\User\\NoUserException\",\"message\":\"Backends provided no user object\",\"code\":0,\"file\":\"/var/www/html/lib/private/Files/Node/Root.php:325\",\"trace\":\"#0 [internal function]: OC\\Files\\Node\\Root->getUserFolder('john')\\n#1 /var/www/html/lib/private/Files/Node/LazyFolder.php(67): call_user_func_array(Array, Array)\\n#2 /var/www/html/lib/private/Files/Node/LazyRoot.php(41): OC\\Files\\Node\\LazyFolder->__call('getUserFolder', Array)\\n#3 /var/www/html/apps/files_sharing/lib/ShareTargetValidator.php(70): OC\\Files\\Node\\LazyRoot->getUserFolder('john')\\n#4 /var/www/html/apps/files_sharing/lib/ShareRecipientUpdater.php(77): OCA\\Files_Sharing\\ShareTargetValidator->verifyMountPoint(Object(OC\\User\\LazyUser), Object(OC\\Share20\\Share), Object(Closure), Array)\\n#5 /var/www/html/apps/files_sharing/lib/Listener/SharesUpdatedListener.php(99): OCA\\Files_Sharing\\ShareRecipientUpdater->updateForAddedShare(Object(OC\\User\\LazyUser), Object(OC\\Share20\\Share))\\n#6 /var/www/html/apps/files_sharing/lib/Listener/SharesUpdatedListener.php(140): OCA\\Files_Sharing\\Listener\\SharesUpdatedListener->{closure:OCA\\Files_Sharing\\Listener\\SharesUpdatedListener::handle():98}()\\n#7 /var/www/html/apps/files_sharing/lib/Listener/SharesUpdatedListener.php(98): OCA\\Files_Sharing\\Listener\\SharesUpdatedListener->markOrRun(Object(OC\\User\\LazyUser), Object(Closure))\\n#8 /var/www/html/lib/private/EventDispatcher/ServiceEventListener.php(57): OCA\\Files_Sharing\\Listener\\SharesUpdatedListener->handle(Object(OCP\\Share\\Events\\ShareCreatedEvent))\\n#9 /var/www/html/3rdparty/symfony/event-dispatcher/EventDispatcher.php(206): OC\\EventDispatcher\\ServiceEventListener->__invoke(Object(OCP\\Share\\Events\\ShareCreatedEvent), 'OCP\\\\Share\\\\Event...', Object(Symfony\\Component\\EventDispatcher\\EventDispatcher))\\n#10 /var/www/html/3rdparty/symfony/event-dispatcher/EventDispatcher.php(56): Symfony\\Component\\EventDispatcher\\EventDispatcher->callListeners(Array, 'OCP\\\\Share\\\\Event...', Object(OCP\\Share\\Events\\ShareCreatedEvent))\\n#11 /var/www/html/lib/private/EventDispatcher/EventDispatcher.php(74): Symfony\\Component\\EventDispatcher\\EventDispatcher->dispatch(Object(OCP\\Share\\Events\\ShareCreatedEvent), 'OCP\\\\Share\\\\Event...')\\n#12 /var/www/html/lib/private/EventDispatcher/EventDispatcher.php(87): OC\\EventDispatcher\\EventDispatcher->dispatch('OCP\\\\Share\\\\Event...', Object(OCP\\Share\\Events\\ShareCreatedEvent))\\n#13 /var/www/html/lib/private/Share20/Manager.php(1909): OC\\EventDispatcher\\EventDispatcher->dispatchTyped(Object(OCP\\Share\\Events\\ShareCreatedEvent))\\n#14 /var/www/html/lib/private/Share20/Manager.php(638): OC\\Share20\\Manager->dispatchEvent(Object(OCP\\Share\\Events\\ShareCreatedEvent), 'share created')\\n#15 /var/www/html/apps/files_sharing/lib/Controller/ShareAPIController.php(813): OC\\Share20\\Manager->createShare(Object(OC\\Share20\\Share))\\n#16 /var/www/html/lib/private/AppFramework/Http/Dispatcher.php(172): OCA\\Files_Sharing\\Controller\\ShareAPIController->createShare('/test_folder', 31, 7, 'Yys9i5z2ymPiurC...', NULL, '', NULL, '', '', '', '[{\\\"value\\\":true,...', NULL)\\n#17 /var/www/html/lib/private/AppFramework/Http/Dispatcher.php(80): OC\\AppFramework\\Http\\Dispatcher->executeController(Object(OCA\\Files_Sharing\\Controller\\ShareAPIController), 'createShare')\\n#18 /var/www/html/lib/private/AppFramework/App.php(138): OC\\AppFramework\\Http\\Dispatcher->dispatch(Object(OCA\\Files_Sharing\\Controller\\ShareAPIController), 'createShare')\\n#19 /var/www/html/lib/private/Route/Router.php(324): OC\\AppFramework\\App::main('OCA\\\\Files_Shari...', 'createShare', Object(OC\\AppFramework\\DependencyInjection\\DIContainer), Array)\\n#20 /var/www/html/ocs/v1.php(78): OC\\Route\\Router->match('/ocsapp/apps/fi...')\\n#21 /var/www/html/ocs/v2.php(10): require_once('/var/www/html/o...')\\n#22 {main}\"}",
        "CustomMessage": "Backends provided no user object for john"
    }
}

Server configuration

Web server: Apache/Nginx

Database: MySQL/Maria/SQLite/PostgreSQL

PHP version: 8.5/8.4/8.3

Nextcloud version: Nextcloud 35.0.0 beta 2

List of activated apps

Enabled:
  - appstore: 2.0.0-dev.0
  - circles: 35.0.0-dev.1
  - cloud_federation_api: 2.0.0-dev.0
  - comments: 2.0.0-dev.0
  - contacts: 8.7.6
  - contactsinteraction: 2.0.0-dev.0
  - dashboard: 8.0.0-dev.0
  - dav: 2.0.0-dev.1
  - federatedfilesharing: 2.0.0-dev.1
  - federation: 2.0.0-dev.0
  - files: 3.0.0-dev.0
  - files_reminders: 2.0.0-dev.0
  - files_sharing: 2.0.0-dev.1
  - files_trashbin: 2.0.0-dev.0
  - files_versions: 2.0.0-dev.0
  - lookup_server_connector: 2.0.0-dev.0
  - oauth2: 2.0.0-dev.0
  - profile: 2.0.0-dev.0
  - provisioning_api: 2.0.0-dev.0
  - settings: 2.0.0-dev.0
  - sharebymail: 2.0.0-dev.0
  - sharing: 1.0.0
  - systemtags: 2.0.0-dev.0
  - theming: 3.0.0-dev.0
  - twofactor_backupcodes: 2.0.0-dev.0
  - updatenotification: 2.0.0-dev.0
  - user_status: 2.0.0-dev.0
  - weather_status: 2.0.0-dev.0
  - webhook_listeners: 2.0.0-dev.0
  - workflowengine: 3.0.0-dev.0
Disabled:
  - admin_audit: 2.0.0-dev.0
  - encryption: 3.0.0-dev.0
  - files_external: 2.0.0-dev.0
  - testing: 2.0.0-dev.0
  - user_ldap: 2.0.0-dev.0

Nextcloud configuration

If you have access to your command line run e.g.:
sudo -u www-data php occ config:list system
from within your Nextcloud installation folder

Browser

Browser name: Firefox/Chrome/Safari/…

Browser version: 124/125/…

Operating system: Windows/Ubuntu/Mac/…

Browser log

Insert your browser log here, this could for example include:
a) The javascript console log
b) The network log
c) ...