diff --git a/communication/provider/matrix/classes/matrix_user_manager.php b/communication/provider/matrix/classes/matrix_user_manager.php
index 2dd4041f8b0c6..34a6b1fa85eac 100644
--- a/communication/provider/matrix/classes/matrix_user_manager.php
+++ b/communication/provider/matrix/classes/matrix_user_manager.php
@@ -67,7 +67,12 @@ public static function get_formatted_matrix_userid(
             $username = self::MATRIX_USER_PREFIX . $username;
         }
 
-        $homeserver = self::get_formatted_matrix_home_server();
+        $homeserver = get_config('communication_matrix', 'matrixhomeservername');
+
+        // Fall back to homeserver URL if name not set.
+        if (empty($homeserver)) {
+            $homeserver = self::get_formatted_matrix_home_server();
+        }
 
         return "@{$username}:{$homeserver}";
     }
diff --git a/communication/provider/matrix/lang/en/communication_matrix.php b/communication/provider/matrix/lang/en/communication_matrix.php
index c5e5eb4f96be4..c101fd16b8f52 100644
--- a/communication/provider/matrix/lang/en/communication_matrix.php
+++ b/communication/provider/matrix/lang/en/communication_matrix.php
@@ -24,6 +24,8 @@
 
 $string['cachedef_serverversions'] = 'Matrix server version information for running servers';
 $string['matrixuserid'] = 'Matrix user ID';
+$string['matrixhomeservername'] = 'Homeserver Name';
+$string['matrixhomeservername_desc'] = 'The name of your Synapse homeserver if different from the URL. The part that follows the <code>@user:</code> in usernames. e.g. <code>@user:example.com</code>.';
 $string['matrixhomeserverurl'] = 'Homeserver URL';
 $string['matrixhomeserverurl_desc'] = 'The URL of the Synapse homeserver to connect to, for user and room creation.';
 $string['matrixaccesstoken'] = 'Access token';
diff --git a/communication/provider/matrix/settings.php b/communication/provider/matrix/settings.php
index 5f23f3240f67b..4a5800647980b 100644
--- a/communication/provider/matrix/settings.php
+++ b/communication/provider/matrix/settings.php
@@ -30,6 +30,11 @@
     $desc = new lang_string('matrixhomeserverurl_desc', 'communication_matrix');
     $settings->add(new admin_setting_configtext('communication_matrix/matrixhomeserverurl', $name, $desc, ''));
 
+    // Home server name.
+    $name = new lang_string('matrixhomeservername', 'communication_matrix');
+    $desc = new lang_string('matrixhomeservername_desc', 'communication_matrix');
+    $settings->add(new admin_setting_configtext('communication_matrix/matrixhomeservername', $name, $desc, ''));
+
     // Access token.
     $name = new lang_string('matrixaccesstoken', 'communication_matrix');
     $desc = new lang_string('matrixaccesstoken_desc', 'communication_matrix');
diff --git a/communication/provider/matrix/tests/matrix_user_manager_test.php b/communication/provider/matrix/tests/matrix_user_manager_test.php
index 559e435e4174b..b84b97a3ac9f7 100644
--- a/communication/provider/matrix/tests/matrix_user_manager_test.php
+++ b/communication/provider/matrix/tests/matrix_user_manager_test.php
@@ -86,12 +86,15 @@ public function test_get_formatted_matrix_userid_unset(): void {
      * @param string $expecteduserid The expected matrix user id
      */
     public function test_get_formatted_matrix_userid(
+        ?string $servername,
         string $server,
         string $username,
         string $expecteduserid,
     ): void {
         $this->resetAfterTest();
-
+        if ($servername !== null) {
+            set_config('matrixhomeservername', $servername, 'communication_matrix');
+        }
         set_config('matrixhomeserverurl', $server, 'communication_matrix');
         $this->assertEquals(
             $expecteduserid,
@@ -106,27 +109,44 @@ public function test_get_formatted_matrix_userid(
      */
     public static function get_formatted_matrix_userid_provider(): array {
         return [
+            'servername' => [
+                'example.org',
+                'https://matrix.example.org',
+                'user',
+                '@user:example.org',
+            ],
+            'servername empty string' => [
+                '',
+                'https://matrix.example.org',
+                'user',
+                '@user:matrix.example.org',
+            ],
             'alphanumeric' => [
+                null,
                 'https://matrix.example.org',
                 'alphabet1',
                 '@alphabet1:matrix.example.org',
             ],
             'chara' => [
+                null,
                 'https://matrix.example.org',
                 'asdf#$%^&*()+{}|<>?!,asdf',
                 '@asdf.................asdf:matrix.example.org',
             ],
             'local server' => [
+                null,
                 'https://synapse',
                 'colin.creavey',
                 '@colin.creavey:synapse',
             ],
             'server with port' => [
+                null,
                 'https://matrix.example.org:8448',
                 'colin.creavey',
                 '@colin.creavey:matrix.example.org',
             ],
             'numeric username' => [
+                null,
                 'https://matrix.example.org',
                 '123456',
                 '@' . matrix_user_manager::MATRIX_USER_PREFIX . '123456:matrix.example.org',