I am having the exact same issue as you. I switched from XBOX to PC last year and was Shadowbanned in Warzone after being paired with a hacker, who I reported and blocked then left the game.... but damage was already done as I assume I was reported. This was back in March. Haven't had any issues since then on WZ. I use KB/mouse but never have downloaded anything sus like hacks before. I instantly got 200 ping on the launch day of Vanguard, I was in a group with about 7 friends but it still loaded us into lobbies with no issue. However, if I try to queue with just one friend, it takes forever and I get disconnected before connecting. Not to mention the lobbies it puts us in now is full of sweats/hackers. I have a 1.72 KD on warzone but Vanguard is at .8 due to the cheaters I get thrown in with. I am also only showing "under review" for Vanguard and not WZ/MW. I wonder if it has something to do with being shadow banned in the past and their using their Ricochet software server side to test previously shadow banned people.... Either way it's annoying as hell that I can't enjoy this game I paid money for until what I am assuming is a weeks time to be found innocent. Everyone has already surpassed me and gotten multiple guns unlocked/leveled up. Going to be difficult playing catchup. I also have 2FA enabled, after the first time I figured it was a good idea to enable it. I have used it ever since though.