Spacewar Only works in Standalone mode, Game Build doesn't work

When I play the game through the editor in standalone mode, the game gets detected by steam as Spacewar, but when i build the game (whether it be Dev build or shipping) it doesnt detect the game, therefore multiplayer doesn’t work.

I’m using Online Steam Subsystem plugin. Modified the DefaultEngine.ini file accordingly.

What am I missing?

Im using UE 5.6.1

Hello @August831 ,
I’m sharing the official Unreal Engine documentation on how to set up your project for distribution on Valve’s Steam platform.

I’m also sharing this forum post, which discusses several possible solutions to the same issue you’re experiencing.

Hope it helps!