Things you need to know about shadowban in cod

Everything We Know About Shadowbanning in Warzone (From My Experience):

New Accounts and Performance: No matter how many new accounts you create, if they are under level 20 and you manage to get 10 kills in any game mode, you'll likely be shadowbanned. I experienced this personally with three new accounts, each getting shadowbanned after hitting 10 kills. However, I then used a level 45 account, did the same, and faced no issues.

Warzone vs. MWIII: If you're shadowbanned in Warzone, there's a good chance you can still play MWIII without a shadowban. Although it's possible to get shadowbanned in MWIII as well, typically, you remain un-banned in this game.

Waiting it Out: The only solution seems to be waiting. For high-level accounts, the shadowban might last more than 3 or 7 days. For new accounts, it usually takes about a day to lift the shadowban.

MWIII Shadowban Check (Related to Point 2): If you're shadowbanned in Warzone and then play MWIII, you might get shadowbanned there too. However, the shadowban in MWIII can be lifted quickly, but the official shadowban page won't update this status. It's always the same message. So, it's worth checking in-game, especially in Ground War mode, where faster matchmaking might indicate you're not shadowbanned.

Warzone Check: The same approach works for Warzone. You can always check in-game, even if the message indicates you're under review. You might not actually be shadowbanned, despite the warning.

If you've recently had a shadowban removed, I recommend (though I haven't tested this myself) playing several Battle Royale matches and intentionally losing them. This strategy is based on advice I've seen from others, and it seems like a good way to avoid getting shadowbanned again. By doing this 3-5 times or as many as you feel comfortable with, it helps show that you're a regular player