Steam dedicated server sessions don't show up

I created a dedicated server using steam. Like this https://www.youtube.com/watch?v=6RlYegIkN0Y&ab_channel=UnrealTek. Everything works fine if I run the dedicated server on my pc I can join it and the hosted sessions show up in the list. But when I run the server at a friends PC we are still able to connect to the dedicated server but the hosted session just wont show up on the list :frowning:

Is there anything extra I need to know or does anyone have any tips I am looking to get this right for so long now :frowning: