Watch the video:
Timestamps:
0:00 - Explanation
0:15 - Is the lobby available?
0:47 - Community server/Friends server?
1:01 - Kicked previously?
1:20 - Verify & Restart Steam
2:22 - Steam/Game in Admin mode
2:55 - Firewall, Internet & More
3:16 - Windows/GPU Update & Restarts
Want to play CS:GO, but can’t join a server or your friends because of the “Failed to join session” error? Well, it’s usually pretty simple to fix. This video covers fixing the error if it’s something with you or just a quirk of the game. By the end, you should know why you can’t join, and probably have the ability to fix it.