It is important to note that reinstallation will load the same game files again and, therefore, won’t be of any help. Perhaps you have tried reinstalling your game but the issue still won’t go away. How to Fix VAC Authentication Error in Windows 10 Sometimes also, VAC could generate a false positive error and turn up the “Unable to verify the game session” message.

When VAC fails to verify your gaming session but you have not in any way tampered with your game files, it means that there is something wrong with the configuration of the files. It is meant to prevent gamers from making changes to game files in order to gain an unfair advantage over other players. VAC (Valve Anti-Cheat System) detects anomalies in installation files. Why Does it Say VAC Was Unable to Verify Your Game Session? We will present a handful of fixes that you can try to get rid of the “VAC was unable to verify your game session” error notification on CS: GO. If you are seeking solutions to this problem, you have come to the right place. But when you try to queue for matchmaking, you might encounter an error message that says, “VAC was unable to verify your game session.” Many online gamers have reported coming across this error when they try to join the Steam community or play a game. Counter-Strike: Global Offensive (CS: GO) is a game enjoyed by many players around the world.

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