Security software can sometimes block the Steamworks API from communicating with the internet. Search for "Allow an app through Windows Firewall" in your Windows search bar. Change settings and locate Steam Web Helper in the list. Ensure both boxes are checked.
One of the most common causes is that Steam doesn't have the necessary permissions to launch the game's API. Completely exit Steam by selecting from the Steam menu in the top left. Right-click the Steam shortcut on your desktop and select Run as administrator Try launching your game again from the library. 2. Allow Steam Through Your Firewall could not initialize steamworks api oneshot top