vielelicht doch??

src/Support/NotificationPayloadFactory.php

@@ -41,12 +41,12 @@ class NotificationPayloadFactory
         $teamsEntityId = '8ffe419f-ca44-4627-a4b2-f223da2d07aa';
 
         // Opens the app side pane and marks the activity as read
-        $teamsTabLink = sprintf(
-            'https://teams.microsoft.com/l/entity/%s/%s',
-            $teamsAppId,
-            $teamsEntityId
-        );
-
+		$teamsTabLink = sprintf(
+			'https://teams.microsoft.com/l/entity/%s/%s?webUrl=%s',
+			$teamsAppId,
+			$teamsEntityId,
+			rawurlencode('https://forum.sbp.de/static/flarum-notify.html?v=2')
+		);
         return [
             'topic' => [
                 'source' => 'text',