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Read that
Tried this. https://support.steampowered.com/kb_article.php?ref=2117-ilzv-2837
and still have the problem.
Valve Anti-Cheat(VAC)
Unable to join matchmaking because an issue with your computer is blocking the VAC system. Please ensure that you are not using any programs that may interfere with VAC and confirm that Steam is correctly installed.
I actually reinstalled my OS to solve this problem. And I didn't install any application(including ANTIVIRUS) because this guide(https://support.steampowered.com/kb_article.php?ref=2117-ilzv-2837) says a third party software could interfere with the game or the Steam.
may Helpful :)