UE 5.3.2 listen server, map only appears for 1 sec after creating game on steam

Greetings!

I’m running UE 5.3.2 with Advanced Steam Sessions, Online Subsystem and Online Subsystem Steam enabled in the default third person c++ template.

Most of the stuff is pretty much UI boilerplate. As far as the logic to create the session is concerned, I am having a game instance with a custom event to create the session.

And this logic in the on click event of the main menu:

This is the overall config of the project:

Things are working fine in the editor or shipping build until I upload it to steam. Whereafter the level that should be loaded only flashes for 1 frame and then I’m back in the main menu, as if my game session was destroyed or something along the lines.

Any pointers would be much appreciated.