“Player blocked” and have never played together ?

Replace Step 2 with "Block this player." and you've got it. Many of us have barely any reports, and it's actually the mass amount of blocking that's doing it. Check out this statement from 343 regarding Halo:

""Recently, however, we noticed that some players were using blocks to avoid playing against upstanding players, as well as negatively impact their rep, specifically in ranked play. As this was never the intent of the system, the Xbox team has pushed out
a recent update that will ignore player blocks in the following (ranked) MCC playlists"

When a major game dev says that the system is flawed, you know there's a problem.

only hope for they never let constroller players and K&M players together.

I was never following them, people who I don't know or have played with or accepted game or chat invites add me as their friend and if I block and mute them they remain exactly where they were .And it just means now I have to see them as a blocked and
muted player

Indeed, Blocking will lessen the chances of being matched up together but, if only a handful of players are availible the options are limited.

If you Mute and AVOID the offending player, it also helps.

Good Luck!!!

Well I have never played that game, but if that's against the COC/TOU policy, then all you can do is file a complaint, avoid the player(s) involved, block communications, and most important, move on.