Plutonium

your ban should be removed within 7 days of ban (if it was your first offense).
you'd have to wait it out.
you can also ask on Discord, higher chances of getting an answer.
also, play on PC, to avoid these unexpected "surprises".

Aguacate7 update Plutonium.

Verify game files, or in worst case scenario, reinstall the game.

Upload them to Google Drive for example, set up so that anyone with the link can see them and put those links here.

As idea said, Steam decks have similar, if not the same HWID because of the same components. However, it isn't worth it to unban every single Steam deck player, because one player was enough to cheat on Steam deck and get everyone else banned. You can try and appeal the ban, and once accepted, start playing on PC. Friendly advice, because you can't really change components on Steam deck, since it's quite limited.

TheOddBreed dude's fully legit, matter of fact they're also mod on there.

Player name: Retrovskii
Reason of report: Possible walling on RepZ community server (NukeJacked to be exact)
Video: https://youtu.be/kRIY5iSAXPg
Seems pretty suspicious to me because they joined mid-game and went 39-2 on Hijacked.

https://www.youtube.com/watch?v=awc3quNjP04

Ping staff on here, and in the meantime, add 2FA to your account.
Lots of people are scammed that way, and they end up getting banned.
Once you get unbanned, avoid scam links.

Will be rendered unusable when Pluto adds Steam Checks.

Most likely it will last, but it will change completely in the close future (as announced in Discord).
The biggest change that's going to come is game ownership verification (meaning it will check if you own the game on Steam, and launch the game if that's true).

Astarte* you can try this, it might work

Download Redists and DirectX:
https://aka.ms/vs/17/release/vc_redist.x64.exe
https://aka.ms/vs/17/release/vc_redist.x86.exe (depending on your OS, but it won't make much difference if you download both)
https://www.microsoft.com/en-us/download/details.aspx?id=35
If it's a path error:
Check if you've chosen the proper place for the game.

CTSDaBest Plutonium isn't providing MW3 DLC's anymore. Use Steam to purchase the full base game with all the DLC's.
This is a preventive measure to avoid C&D letter.

This surely isn't hard, is it?
https://youtu.be/j_i3Eso1yOg

You have to choose the place where you've downloaded MW3.
In most of the cases, it's in Steam Library.
The path you have to follow is:
C:\Program Files (x86)\Steam\steamapps\common
In case you've got the library on second drive, use the following:
D:\SteamLibrary\steamapps\common\

LumbagoLover Dick move by Activision. The games are basically unsupported (meaning it gets no patches and updates), yet they expect us to pay for them.

Vangos5674 Hardly believe that we're in the good. Pluto's gonna get hit sooner or later. It doesn't matter whether the links got removed or not.
It makes 0 sense by Activision to shut down any of the projects, SM2, Xlabs, Plutonium, or anything else. They're just polishing the unpolished games (that are, by the way, unsupported by Activision and/or other parties), getting 0 revenue from that (except for donations).

Astarte* You getting any errors?

Parzalai Just launching Pluto would make your steam profile say that you're currently in game (but won't specify which one).

Poonzy Before getting in reparation of game files, make sure that none of these are bound to something https://prnt.sc/od-b4Uf5-nfe
If you've bound anything, simply unbind it, and try moving again.

If it doesn't work, repair your game files https://plutonium.pw/docs/repair/

No, I don't think anyone could check that for ya.
If it said that the ban was 20 days, you have to wait those 20 days.
In the meantime, remove all of the mod menus that require injecting, remove cheats, all that stuff that would get you banned.

https://plutonium.pw/docs/anticheat/