If basic restarts do not work, your security software or system settings might be blocking the API initialization: Why must SteamworksAPI be initialized before running code?
: OneShot requires the Steam "overlay" and API to be active. Avoid launching the game from a desktop shortcut or the .exe file directly; always use the Play button within your Steam Library. could not initialize steamworks api oneshot
: Right-click your Steam shortcut and select Run as administrator . You may also need to do this for the oneshot.exe file located in your game installation folder. If basic restarts do not work, your security