I used the "Shutdown Multiplayer Server" API call from inside unreal engine using both the playfab SDK node and the HTTP request node with correct parameters. The result is: { "code": 200, "status": "OK", "data": {} }. But even then the server instance is not shutting down. We noticed with few tests that it closed when there was still players on the server but when the number of players was 0 it didn't close. Can you check if there is an issue from your side? or is it something that we are missing on our side?