diff --git a/lib/Controller/RoomController.php b/lib/Controller/RoomController.php
index 8764407fbb5..71cbf5eee06 100644
--- a/lib/Controller/RoomController.php
+++ b/lib/Controller/RoomController.php
@@ -8,6 +8,8 @@
 
 namespace OCA\Talk\Controller;
 
+use OC\Authentication\Token\IProvider;
+use OC\Authentication\Token\IToken;
 use OCA\Circles\Model\Circle;
 use OCA\Talk\Capabilities;
 use OCA\Talk\Config;
@@ -82,21 +84,23 @@
 use OCP\AppFramework\Services\IAppConfig;
 use OCP\AppFramework\Utility\ITimeFactory;
 use OCP\Calendar\CalendarEventStatus;
-use OCP\Calendar\Exceptions\CalendarException;
 use OCP\Calendar\ICreateFromString;
 use OCP\Calendar\IManager as ICalendarManager;
 use OCP\EventDispatcher\IEventDispatcher;
 use OCP\Federation\ICloudIdManager;
+use OCP\Http\Client\IClientService;
 use OCP\IConfig;
 use OCP\IGroup;
 use OCP\IGroupManager;
 use OCP\IL10N;
 use OCP\IPhoneNumberUtil;
 use OCP\IRequest;
+use OCP\ISession;
 use OCP\IURLGenerator;
 use OCP\IUser;
 use OCP\IUserManager;
 use OCP\Security\Bruteforce\IThrottler;
+use OCP\Security\ISecureRandom;
 use OCP\User\Events\UserLiveStatusEvent;
 use OCP\UserStatus\IManager as IUserStatusManager;
 use OCP\UserStatus\IUserStatus;
@@ -149,6 +153,10 @@ public function __construct(
 		protected BanService $banService,
 		protected IURLGenerator $url,
 		protected IL10N $l,
+		protected IClientService $clientService,
+		protected IProvider $authTokenProvider,
+		protected ISession $serverSession,
+		protected ISecureRandom $random,
 	) {
 		parent::__construct($appName, $request);
 	}
@@ -2854,7 +2862,8 @@ public function scheduleMeeting(string $calendarUri, int $start, ?array $attende
 		}
 
 		$eventBuilder = $this->calendarManager->createEventBuilder();
-		$calendars = $this->calendarManager->getCalendarsForPrincipal('principals/users/' . $this->userId, [$calendarUri]);
+		$principalUri = 'principals/users/' . $this->userId;
+		$calendars = $this->calendarManager->getCalendarsForPrincipal($principalUri, [$calendarUri]);
 
 		if (empty($calendars)) {
 			return new DataResponse(['error' => 'calendar'], Http::STATUS_BAD_REQUEST);
@@ -2936,13 +2945,50 @@ public function scheduleMeeting(string $calendarUri, int $start, ?array $attende
 			);
 		}
 
+		$ics = $eventBuilder->toIcs();
+		$name = $this->room->getToken() . '-' . $this->timeFactory->getTime() . '.ics';
+		$calendarUri = $this->url->getBaseUrl() . '/remote.php/dav/calendars/' . $user->getUID() . '/' . $calendar->getUri() . '/' . $name;
+
+		try {
+			$loginname = $this->serverSession->get('loginname');
+			$token = $this->random->generate(72, ISecureRandom::CHAR_UPPER . ISecureRandom::CHAR_LOWER . ISecureRandom::CHAR_DIGITS);
+
+			$this->authTokenProvider->generateToken(
+				$token,
+				$user->getUID(),
+				$loginname,
+				null,
+				'Nextcloud Spreed Calendar Integration',
+				IToken::TEMPORARY_TOKEN,
+				IToken::DO_NOT_REMEMBER
+			);
+		} catch (\Exception $e) {
+			$this->logger->debug('Failed to get calendar to schedule a meeting', ['exception' => $e]);
+			return new DataResponse(['error' => 'calendar'], Http::STATUS_BAD_REQUEST);
+		}
+
+		$client = $this->clientService->newClient();
+		$options = [
+			'headers' => [
+				'Content-Type' => 'text/html; charset=UTF-8',
+			],
+			'nextcloud' => [
+				'allow_local_address' => true,
+			],
+			'body' => $ics,
+			'verify' => false,
+			'auth' => [$loginname, $token],
+		];
+
 		try {
-			$eventBuilder->createInCalendar($calendar);
-		} catch (\InvalidArgumentException|CalendarException $e) {
+			$client->put($calendarUri, $options);
+		} catch (\Exception $e) {
 			$this->logger->debug('Failed to get calendar to schedule a meeting', ['exception' => $e]);
 			return new DataResponse(['error' => 'calendar'], Http::STATUS_BAD_REQUEST);
 		}
 
+		$this->authTokenProvider->invalidateToken($token);
+
 		return new DataResponse(null, Http::STATUS_OK);
 	}
 }
diff --git a/psalm.xml b/psalm.xml
index 641e397c11f..d103ac56efa 100644
--- a/psalm.xml
+++ b/psalm.xml
@@ -70,6 +70,7 @@
 		</UndefinedDocblockClass>
 	</issueHandlers>
 	<stubs>
+		<file name="tests/stubs/oc_authentication_token_provider.php" />
 		<file name="tests/stubs/oc_comments_comment.php" />
 		<file name="tests/stubs/oc_comments_manager.php" />
 		<file name="tests/stubs/oc_core_command_base.php" />
diff --git a/tests/psalm-baseline.xml b/tests/psalm-baseline.xml
index d0014c298eb..83a56d6206b 100644
--- a/tests/psalm-baseline.xml
+++ b/tests/psalm-baseline.xml
@@ -85,14 +85,6 @@
       <code><![CDATA[EditingCircleEvent]]></code>
     </UndefinedClass>
   </file>
-  <file src="lib/MatterbridgeManager.php">
-    <UndefinedClass>
-      <code><![CDATA[$this->tokenProvider]]></code>
-      <code><![CDATA[$this->tokenProvider]]></code>
-      <code><![CDATA[$this->tokenProvider]]></code>
-      <code><![CDATA[private]]></code>
-    </UndefinedClass>
-  </file>
   <file src="lib/Migration/Version2001Date20170707115443.php">
     <InvalidArrayAccess>
       <code><![CDATA[$return['num_rooms']]]></code>
diff --git a/tests/stubs/oc_authentication_token_provider.php b/tests/stubs/oc_authentication_token_provider.php
new file mode 100644
index 00000000000..fba6e97ad48
--- /dev/null
+++ b/tests/stubs/oc_authentication_token_provider.php
@@ -0,0 +1,35 @@
+<?php
+
+/**
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OC\Authentication\Token {
+
+	use OCP\Authentication\Token\IToken as OCPIToken;
+
+	interface IToken extends \JsonSerializable {
+		public const TEMPORARY_TOKEN = 0;
+		public const DO_NOT_REMEMBER = 0;
+
+	}
+
+	interface IProvider {
+		public function generateToken(string $token,
+			string $uid,
+			string $loginName,
+			?string $password,
+			string $name,
+			int $type = OCPIToken::TEMPORARY_TOKEN,
+			int $remember = OCPIToken::DO_NOT_REMEMBER,
+			?array $scope = null,
+		): IToken;
+
+		public function invalidateToken(string $token);
+
+		public function invalidateTokenById(string $uid, int $id);
+
+		public function getTokenByUser(string $uid): array;
+	}
+}