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…

Hello @August831 , I’m sharing the official Unreal Engine documentation on how to set up your project for distribution on Valve’s Steam platform. [image] Online Subsystem Steam Interface in Unreal Engine | Unreal Engine 5.8... An overview of Online Subsystem Steam, including how to set…

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

Development Programming & Scripting Multiplayer & Networking

BRGEzedeRocco (BRGEzedeRocco) October 29, 2026, 5:55pm 2

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!