diff --git a/mod/bigbluebuttonbn/classes/extension.php b/mod/bigbluebuttonbn/classes/extension.php
index c1eb66ea8eb..3162b43426e 100644
--- a/mod/bigbluebuttonbn/classes/extension.php
+++ b/mod/bigbluebuttonbn/classes/extension.php
@@ -42,17 +42,23 @@ class extension {
      * @param string $action
      * @param array $data
      * @param array $metadata
+     * @param int|null $instanceid
      * @return array associative array with the additional data and metadata (indexed by 'data' and
      * 'metadata' keys).
      */
-    public static function action_url_addons(string $action = '', array $data = [], array $metadata = []): array {
+    public static function action_url_addons(
+        string $action = '',
+        array $data = [],
+        array $metadata = [],
+        ?int $instanceid = null
+    ): array {
         $allmutationclass = self::get_instances_implementing(action_url_addons::class);
         $additionaldata = [];
         $additionalmetadata = [];
         foreach ($allmutationclass as $mutationclass) {
             // Here we intentionally just pass data and metadata and not the result as we
             // do not want subplugin to assume that another subplugin is doing a modification.
-            ['data' => $newdata, 'metadata' => $newmetadata] = $mutationclass->execute($action, $data, $metadata);
+            ['data' => $newdata, 'metadata' => $newmetadata] = $mutationclass->execute($action, $data, $metadata, $instanceid);
             $additionaldata = array_merge($additionaldata, $newdata ?? []);
             $additionalmetadata = array_merge($additionalmetadata, $newmetadata ?? []);
         }
@@ -62,6 +68,52 @@ class extension {
         ];
     }
 
+    /**
+     * Get new instance of classes that are named on the base of this classname and implementing this class
+     *
+     * @param string $classname
+     * @param array|null $newparameters additional parameters for the constructor.
+     * @return array
+     */
+    protected static function get_instances_implementing(string $classname, ?array $newparameters = []): array {
+        $classes = self::get_classes_implementing($classname);
+        sort($classes); // Make sure all extension classes are returned in the same order. This is arbitrarily in
+        // alphabetical order and depends on the classname but this one way to ensure consistency across calls.
+        return array_map(function($targetclassname) use ($newparameters) {
+            // If $newparameters is null, the constructor will be called without parameters.
+            return new $targetclassname(...$newparameters);
+        }, $classes);
+    }
+
+    /**
+     * Get classes are named on the base of this classname and implementing this class
+     *
+     * @param string $classname
+     * @return array
+     */
+    protected static function get_classes_implementing(string $classname): array {
+        // Get the class basename without Reflection API.
+        $classnamecomponents = explode("\\", $classname);
+        $classbasename = end($classnamecomponents);
+        $allsubs = core_plugin_manager::instance()->get_plugins_of_type(self::BBB_EXTENSION_PLUGIN_NAME);
+        $extensionclasses = [];
+        foreach ($allsubs as $sub) {
+            if (!$sub->is_enabled()) {
+                continue;
+            }
+            $targetclassname = "\\bbbext_{$sub->name}\\bigbluebuttonbn\\$classbasename";
+            if (!class_exists($targetclassname)) {
+                continue;
+            }
+            if (!is_subclass_of($targetclassname, $classname)) {
+                debugging("The class $targetclassname should extend $classname in the subplugin {$sub->name}. Ignoring.");
+                continue;
+            }
+            $extensionclasses[] = $targetclassname;
+        }
+        return $extensionclasses;
+    }
+
     /**
      * Get all mod_form addons classes instances
      *
@@ -142,50 +194,4 @@ class extension {
             $fmclass->delete_instance($id);
         }
     }
-
-    /**
-     * Get new instance of classes that are named on the base of this classname and implementing this class
-     *
-     * @param string $classname
-     * @param array|null $newparameters additional parameters for the constructor.
-     * @return array
-     */
-    protected static function get_instances_implementing(string $classname, ?array $newparameters = []): array {
-        $classes = self::get_classes_implementing($classname);
-        sort($classes); // Make sure all extension classes are returned in the same order. This is arbitrarily in
-        // alphabetical order and depends on the classname but this one way to ensure consistency across calls.
-        return array_map(function($targetclassname)  use ($newparameters) {
-            // If $newparameters is null, the constructor will be called without parameters.
-            return new $targetclassname(...$newparameters);
-        }, $classes);
-    }
-
-    /**
-     * Get classes are named on the base of this classname and implementing this class
-     *
-     * @param string $classname
-     * @return array
-     */
-    protected static function get_classes_implementing(string $classname): array {
-        // Get the class basename without Reflection API.
-        $classnamecomponents = explode("\\", $classname);
-        $classbasename = end($classnamecomponents);
-        $allsubs = core_plugin_manager::instance()->get_plugins_of_type(self::BBB_EXTENSION_PLUGIN_NAME);
-        $extensionclasses = [];
-        foreach ($allsubs as $sub) {
-            if (!$sub->is_enabled()) {
-                continue;
-            }
-            $targetclassname = "\\bbbext_{$sub->name}\\bigbluebuttonbn\\$classbasename";
-            if (!class_exists($targetclassname)) {
-                continue;
-            }
-            if (!is_subclass_of($targetclassname, $classname)) {
-                debugging("The class $targetclassname should extend $classname in the subplugin {$sub->name}. Ignoring.");
-                continue;
-            }
-            $extensionclasses[] = $targetclassname;
-        }
-        return $extensionclasses;
-    }
 }
diff --git a/mod/bigbluebuttonbn/classes/local/proxy/bigbluebutton_proxy.php b/mod/bigbluebuttonbn/classes/local/proxy/bigbluebutton_proxy.php
index 0c0c9f5b23d..c0c0a8c0879 100644
--- a/mod/bigbluebuttonbn/classes/local/proxy/bigbluebutton_proxy.php
+++ b/mod/bigbluebuttonbn/classes/local/proxy/bigbluebutton_proxy.php
@@ -125,7 +125,7 @@ class bigbluebutton_proxy extends proxy_base {
                 $data['avatarURL'] = self::get_avatar_url($user)->out(false);
             }
         }
-        return self::action_url('join', $data);
+        return self::action_url('join', $data, [], $instance->get_instance_id());
     }
 
     /**
@@ -464,6 +464,7 @@ class bigbluebutton_proxy extends proxy_base {
      * @param array $metadata
      * @param string|null $presentationname
      * @param string|null $presentationurl
+     * @param int|null $instanceid
      * @return array
      * @throws bigbluebutton_exception
      */
@@ -471,9 +472,10 @@ class bigbluebutton_proxy extends proxy_base {
         array $data,
         array $metadata,
         ?string $presentationname = null,
-        ?string $presentationurl = null
+        ?string $presentationurl = null,
+        ?int $instanceid = null
     ): array {
-        $createmeetingurl = self::action_url('create', $data, $metadata);
+        $createmeetingurl = self::action_url('create', $data, $metadata, $instanceid);
 
         $curl = new curl();
         if (!is_null($presentationname) && !is_null($presentationurl)) {
@@ -507,10 +509,11 @@ class bigbluebutton_proxy extends proxy_base {
      * Get meeting info for a given meeting id
      *
      * @param string $meetingid
+     * @param int|null $instanceid
      * @return array
      */
-    public static function get_meeting_info(string $meetingid): array {
-        $xmlinfo = self::fetch_endpoint_xml('getMeetingInfo', ['meetingID' => $meetingid]);
+    public static function get_meeting_info(string $meetingid, ?int $instanceid = null): array {
+        $xmlinfo = self::fetch_endpoint_xml('getMeetingInfo', ['meetingID' => $meetingid], [], $instanceid);
         self::assert_returned_xml($xmlinfo, ['meetingid' => $meetingid]);
         return (array) $xmlinfo;
     }
@@ -520,9 +523,10 @@ class bigbluebutton_proxy extends proxy_base {
      *
      * @param string $meetingid
      * @param string $modpw
+     * @param int|null $instanceid
      */
-    public static function end_meeting(string $meetingid, string $modpw): void {
-        $xml = self::fetch_endpoint_xml('end', ['meetingID' => $meetingid, 'password' => $modpw]);
+    public static function end_meeting(string $meetingid, string $modpw, ?int $instanceid = null): void {
+        $xml = self::fetch_endpoint_xml('end', ['meetingID' => $meetingid, 'password' => $modpw], [], $instanceid);
         self::assert_returned_xml($xml, ['meetingid' => $meetingid]);
     }
 
diff --git a/mod/bigbluebuttonbn/classes/local/proxy/proxy_base.php b/mod/bigbluebuttonbn/classes/local/proxy/proxy_base.php
index 2fd0d1b7c6e..ae21aa13f41 100644
--- a/mod/bigbluebuttonbn/classes/local/proxy/proxy_base.php
+++ b/mod/bigbluebuttonbn/classes/local/proxy/proxy_base.php
@@ -52,11 +52,18 @@ abstract class proxy_base {
      * @param string $action
      * @param array $data
      * @param array $metadata
+     * @param int|null $instanceid
      * @return string
      */
-    protected static function action_url(string $action = '', array $data = [], array $metadata = []): string {
+    protected static function action_url(
+        string $action = '',
+        array $data = [],
+        array $metadata = [],
+        ?int $instanceid = null
+    ): string {
         $baseurl = self::sanitized_url() . $action . '?';
-        ['data' => $additionaldata, 'metadata' => $additionalmetadata] = extension::action_url_addons($action, $data, $metadata);
+        ['data' => $additionaldata, 'metadata' => $additionalmetadata] =
+            extension::action_url_addons($action, $data, $metadata, $instanceid);
         $data = array_merge($data, $additionaldata ?? []);
         $metadata = array_merge($metadata, $additionalmetadata ?? []);
 
@@ -168,12 +175,14 @@ abstract class proxy_base {
      * @param string $action
      * @param array $data
      * @param array $metadata
+     * @param int|null $instanceid
      * @return null|bool|\SimpleXMLElement
      */
     protected static function fetch_endpoint_xml(
         string $action,
         array $data = [],
-        array $metadata = []
+        array $metadata = [],
+        ?int $instanceid = null
     ) {
         if (PHPUNIT_TEST && !defined('TEST_MOD_BIGBLUEBUTTONBN_MOCK_SERVER')) {
             return true; // In case we still use fetch and mock server is not defined, this prevents
@@ -181,7 +190,7 @@ abstract class proxy_base {
             // for example.
         }
         $curl = new curl();
-        return $curl->get(self::action_url($action, $data, $metadata));
+        return $curl->get(self::action_url($action, $data, $metadata, $instanceid));
     }
 
     /**
diff --git a/mod/bigbluebuttonbn/classes/local/proxy/recording_proxy.php b/mod/bigbluebuttonbn/classes/local/proxy/recording_proxy.php
index 777f277badd..f3df3de5d11 100644
--- a/mod/bigbluebuttonbn/classes/local/proxy/recording_proxy.php
+++ b/mod/bigbluebuttonbn/classes/local/proxy/recording_proxy.php
@@ -49,7 +49,7 @@ class recording_proxy extends proxy_base {
      * @param string $recordid a recording id
      * @return bool
      */
-    public static function delete_recording(string $recordid): bool {
+    public static function delete_recording(string $recordid, ?int $instanceid = null): bool {
         $result = self::fetch_endpoint_xml('deleteRecordings', ['recordID' => $recordid]);
         if (!$result || $result->returncode != 'SUCCESS') {
             return false;
diff --git a/mod/bigbluebuttonbn/classes/meeting.php b/mod/bigbluebuttonbn/classes/meeting.php
index 83ca31807d8..71449bb5e80 100644
--- a/mod/bigbluebuttonbn/classes/meeting.php
+++ b/mod/bigbluebuttonbn/classes/meeting.php
@@ -166,7 +166,13 @@ class meeting {
         $presentation = $this->instance->get_presentation_for_bigbluebutton_upload(); // The URL must contain nonce.
         $presentationname = $presentation['name'] ?? null;
         $presentationurl = $presentation['url'] ?? null;
-        $response = bigbluebutton_proxy::create_meeting($data, $metadata, $presentationname, $presentationurl);
+        $response = bigbluebutton_proxy::create_meeting(
+            $data,
+            $metadata,
+            $presentationname,
+            $presentationurl,
+            $this->instance->get_instance_id()
+        );
         // New recording management: Insert a recordingID that corresponds to the meeting created.
         if ($this->instance->is_recorded()) {
             $recording = new recording(0, (object) [
@@ -184,7 +190,11 @@ class meeting {
      * Send an end meeting message to BBB server
      */
     public function end_meeting() {
-        bigbluebutton_proxy::end_meeting($this->instance->get_meeting_id(), $this->instance->get_moderator_password());
+        bigbluebutton_proxy::end_meeting(
+            $this->instance->get_meeting_id(),
+            $this->instance->get_moderator_password(),
+            $this->instance->get_instance_id()
+        );
     }
 
     /**
@@ -240,7 +250,7 @@ class meeting {
         $meetinginfo->statusrunning = false;
         $meetinginfo->createtime = null;
 
-        $info = self::retrieve_cached_meeting_info($this->instance->get_meeting_id(), $updatecache);
+        $info = self::retrieve_cached_meeting_info($this->instance, $updatecache);
         if (!empty($info)) {
             $meetinginfo->statusrunning = $info['running'] === 'true';
             $meetinginfo->createtime = $info['createTime'] ?? null;
@@ -322,12 +332,13 @@ class meeting {
     /**
      * Gets a meeting info object cached or fetched from the live session.
      *
-     * @param string $meetingid
+     * @param instance $instance
      * @param bool $updatecache
      *
      * @return array
      */
-    protected static function retrieve_cached_meeting_info($meetingid, $updatecache = false) {
+    protected static function retrieve_cached_meeting_info(instance $instance, $updatecache = false) {
+        $meetingid = $instance->get_meeting_id();
         $cachettl = (int) config::get('waitformoderator_cache_ttl');
         $cache = cache::make_from_params(cache_store::MODE_APPLICATION, 'mod_bigbluebuttonbn', 'meetings_cache');
         $result = $cache->get($meetingid);
diff --git a/mod/bigbluebuttonbn/tests/fixtures/extension/simple/classes/bigbluebuttonbn/action_url_addons.php b/mod/bigbluebuttonbn/tests/fixtures/extension/simple/classes/bigbluebuttonbn/action_url_addons.php
index 9919e8e9ef4..3cf64854dd3 100644
--- a/mod/bigbluebuttonbn/tests/fixtures/extension/simple/classes/bigbluebuttonbn/action_url_addons.php
+++ b/mod/bigbluebuttonbn/tests/fixtures/extension/simple/classes/bigbluebuttonbn/action_url_addons.php
@@ -31,13 +31,28 @@ class action_url_addons extends \mod_bigbluebuttonbn\local\extension\action_url_
      * @param string $action
      * @param array $data
      * @param array $metadata
+     * @param int|null $instanceid
      * @return array associative array with the additional data and metadata (indexed by 'data' and
      * 'metadata' keys)
      */
-    public function execute(string $action = '', array $data = [], array $metadata = []): array {
+    public function execute(
+        string $action = '',
+        array $data = [],
+        array $metadata = [],
+        ?int $instanceid = null
+    ): array {
+        if ($action == 'create' || $action == 'join') {
+            global $DB;
+            $record = $DB->get_record('bbbext_simple', [
+                'bigbluebuttonbnid' => $instanceid,
+            ]);
+            if ($record) {
+                $metadata['newfield'] = $record->newfield ?? '';
+            }
+        }
         return [
-            'data' => $action == 'create' ? [] : ['a', 'b'],
-            'metadata' => in_array('Test', $metadata) ? ['c', 'd'] : []
+            'data' => $data,
+            'metadata' => $metadata,
         ];
     }
 }
diff --git a/mod/bigbluebuttonbn/tests/fixtures/extension/simple/classes/bigbluebuttonbn/mod_instance_helper.php b/mod/bigbluebuttonbn/tests/fixtures/extension/simple/classes/bigbluebuttonbn/mod_instance_helper.php
index af79fe7e4bf..813996a66be 100644
--- a/mod/bigbluebuttonbn/tests/fixtures/extension/simple/classes/bigbluebuttonbn/mod_instance_helper.php
+++ b/mod/bigbluebuttonbn/tests/fixtures/extension/simple/classes/bigbluebuttonbn/mod_instance_helper.php
@@ -53,10 +53,10 @@ class mod_instance_helper extends \mod_bigbluebuttonbn\local\extension\mod_insta
         if (empty($record)) {
             $record = new stdClass();
             $record->bigbluebuttonbnid = $bigbluebuttonbn->id;
-            $record->newfield = $bigbluebuttonbn->newfield;
+            $record->newfield = $bigbluebuttonbn->newfield ?? '';
             $DB->insert_record('bbbext_simple', $record);
         } else {
-            $record->newfield = $bigbluebuttonbn->newfield;
+            $record->newfield = $bigbluebuttonbn->newfield ?? '';
             $DB->update_record('bbbext_simple', $record);
         }
     }
diff --git a/mod/bigbluebuttonbn/tests/local/extension_test.php b/mod/bigbluebuttonbn/tests/local/extension_test.php
index f7827373174..be907af02a9 100644
--- a/mod/bigbluebuttonbn/tests/local/extension_test.php
+++ b/mod/bigbluebuttonbn/tests/local/extension_test.php
@@ -18,7 +18,9 @@ namespace mod_bigbluebuttonbn\local;
 use backup;
 use backup_controller;
 use mod_bigbluebuttonbn\extension;
+use mod_bigbluebuttonbn\instance;
 use mod_bigbluebuttonbn\local\extension\mod_instance_helper;
+use mod_bigbluebuttonbn\meeting;
 use mod_bigbluebuttonbn\test\subplugins_test_helper_trait;
 use mod_bigbluebuttonbn\test\testcase_helper_trait;
 use restore_controller;
@@ -152,17 +154,40 @@ class extension_test extends \advanced_testcase {
     public function test_action_url_addons() {
         // Enable plugin.
         $this->enable_plugins(true);
-        // Set a random var here.
-        $var1 = [];
-        $var2 = ['Test'];
-        ['data' => $additionalvar1, 'metadata' => $additionalvar2] = extension::action_url_addons('create', [], ['Test']);
+        $course = $this->get_course();
+        [$cm, $cminfo, $bbactivity] = $this->create_instance($course);
+        $bbactivity->newfield = 4;
+        extension::update_instance($bbactivity);
+        ['data' => $additionalvar1, 'metadata' => $additionalvar2] =
+            extension::action_url_addons('create', [], ['bbb-meta' => 'Test'], $bbactivity->id);
         $this->assertEmpty($additionalvar1);
         $this->assertCount(2, $additionalvar2);
+        $this->assertEquals($additionalvar2['newfield'], 4);
         ['data' => $additionalvar1, 'metadata' => $additionalvar2] = extension::action_url_addons('delete');
-        $this->assertNotEmpty($additionalvar1);
+        $this->assertEmpty($additionalvar1);
         $this->assertEmpty($additionalvar2);
     }
 
+    /**
+     * Test the action_url_addons with plugin enabled
+     *
+     * @return void
+     * @covers \mod_bigbluebuttonbn\extension::action_url_addons
+     */
+    public function test_join_url_with_additional_field() {
+        $this->initialise_mock_server();
+        // Enable plugin.
+        $this->enable_plugins(true);
+        $course = $this->get_course();
+        [$cm, $cminfo, $bbactivity] = $this->create_instance($course);
+        $bbactivity->newfield = 4;
+        extension::update_instance($bbactivity);
+        $instance = instance::get_from_instanceid($bbactivity->id);
+        $meeting = new meeting($instance);
+        $meetingjoinurl = $meeting->get_join_url();
+        $this->assertStringContainsString('newfield=4', $meetingjoinurl);
+    }
+
     /**
      * Test backup restore (with extension)
      *