vielelicht doch??

src/Support/NotificationPayloadFactory.php

@@ -42,11 +42,11 @@ class NotificationPayloadFactory
 
         // Opens the app side pane and marks the activity as read
 		$teamsTabLink = sprintf(
-            'https://teams.microsoft.com/l/entity/%s/%s',
+			'https://teams.microsoft.com/l/entity/%s/%s?webUrl=%s',
 			$teamsAppId,
-            $teamsEntityId
+			$teamsEntityId,
+			rawurlencode('https://forum.sbp.de/static/flarum-notify.html?v=2')
 		);
-
         return [
             'topic' => [
                 'source' => 'text',