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Geez... I'm not even doing multiplayer, but I seem to remember that games had that good old "start the game, go to lobby"-scheme...
You need to kick them out of your account before they do any more damage to it.
Do all the following steps to properly secure your account.
Scan for malware https://www.malwarebytes.com/
Deauthorize all other devices https://store.steampowered.com/twofactor/manage
Change passwords from a clean computer
Revoke the API key https://gtm.steamproxy.vip/dev/apikey
Generate new backup codes
What they are hoping for is for you to try and trade your items to your friends account. At which point a bot logged into your accout will cancel that trade and instantly create a duplicate trade, pointed at an account using the same avatar that's on your friends account. Then when you confirm the trade, they do as well, and all your items are permanently lost.
1. Scan for malware ... Your account is compromised.
https://www.malwarebytes.com/
2. Check that the email and phone number on the Steam account are still yours.
3. Deauthorize all other devices. https://store.steampowered.com/twofactor/manage
4. Change passwords from a clean computer.
5. Generate new backup codes for your Mobile App. https://store.steampowered.com/twofactor/manage
6. Revoke the API key (there should be no key). https://gtm.steamproxy.vip/dev/apikey.