After a few days of trying, I began to think that there was something wrong with my own project skills, so I created a new test project. I quickly opened it through the desktop 4.25 engine, but did not open the epic client. stay DefaultEngine.ini The code in the official online subsystem steam document is added in：
Three plug-ins of onlinesubsystem steam sockets steam shared are opened to run the window independently, but they are still unsuccessful.
I used my own project to follow the above steps, and the package was not successful
I can work on 4.24 and below，Neither 4.25 nor 4.26 is acceptable