Shipped builds with steam oss can't find session

Hello! While I was developing a multiplayer game for steam, I hit a huge roadblock - when I launch development builds (for debug prints) on two separate computers (Windows 10 and Windows 11) with two different steam accounts, and create a session on one of them, another can’t find that session, even though I can connect to it using invite to game via steam interface.

I am using unreal engine 5.5.4, blueprints, advanced sessions plugin, and steam oss. The code for creating and finding sessions is below.

Below is the project’s configuration.

DefaultEngine.ini

steam_appid.txt

Build.cs

Target.cs

OnlineSessionInterfaceSteam.cpp

This is how it looks inside of game.

I was following different tutorials, but couldn’t find any solutions yet. Am I missing something?
Thanks