ok so I've seen this issue around with no explanation on how to fix it, "Valve Anti-Cheat challenge timed out. Please ensure that you are not using any programs that may interfere with VAC, and confirm that Steam is correctly installed". I got banned for a bit because I couldn't rejoin the match no matter how hard I tried. I had nothing else running except discord, steam, and deadlock. I've noticed CSGO has the same issue so I assume its something the dev team cannot fix.
match ID is: 35505874
match ID is: 35505874