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In the top bar menu, select Steam. If there is an option to "Go Online" you are offline. If you are already online you could also try restarting steam, and logging in and out of your plaza account in the launcher.
 
Hey there!
Are you launching the game through a shortcut to ck2game.exe or are you launching it through steam? Sometimes the application doesn't manage to make the connection to the steam API if it wasn't launched through steam.
 
No, the preferred method of starting the game to get the Steam API working is to start it through the Steam interface.
You could try to back-up your saves, uninstall the game, clean your user folder, and then re-install it.