I had the issue happen 2 matches ago. I restarted the game and was able to play. I also had Discord open, YT and Steam.
I have 618hrs played (according to Steam). Never been flagged or had an issue prior to today. I have never cheated IN MY LIFE and I am VERY ANTI-Cheating! I report EVERYONE that kills me because I can't tell who cheats or not.
Last thing I was doing in game was changing my profile. I had selected new stats to display. Upon exiting the profile screen, I went to select multiplayer and it kicked me and gave me the same message posted in the OP screenshot.
Nothing on my system has changed except the latest MS updates, updates to Discord and Root (Discord alternative). I use my PC for work, there is nothing shady about it. Secure boot is enabled and as I said, never flagged before.
Hope this helps and it doesn't continue to happen.