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Scan for malware. https://www.malwarebytes.com/
Deauthorize all devices https://store.steampowered.com/twofactor/manage
Change your password on a secure device.
Generate new back up codes. https://store.steampowered.com/twofactor/manage
Revoke the api key https://steamcommunity.com/dev/apikey
Scammed items are not returned https://support.steampowered.com/kb_article.php?ref=9958-MJDG-3003
Test with a browser.
If you did not need to confirm the trade but still can use the codes,
someone duplicated your auth app.
If its on phone, it points to someone having gained access to your phone account and backups.
So make sure you get the facts straight to find the scale of the problem.
In any case, if a trade happened without your interaction,
secure the phone account as well.
And all accounts with the same password or any connection. (Dont re-use passwords in general)
My guess, the best approach to start fresh, set steam guard to email. And then set up steam guard again to use the app. To invalidate the old instance.
This requires that your email is safe!
Do not disable steam guard in the process.
That doesn't make your account immune to being compromised. It just an extra key. If you give your keys away to you home someone can enter it and steal stuff. You've clearly logged in on a dodgy site giving them access to your account.
Do the steps in post #1 to secure your account.
Stop using dodgy sites.
Remove the link as naming and shaming is against the rules and could get you in trouble. But but you naming a thief = worthless. For all we know you scammed them and they could plug your profile link in another thread. You and only YOU should report the account via their profile page, block and move on.
All trades are final. There is no way to get your items back.
If you do post 1, the hijacker still has the same tools.
Doing these 2 steps
Deauthorize all devices https://store.steampowered.com/twofactor/manage
and
Change your password on a secure device.
Will prevent a duplicate Authenticator from working as it'd require the new password. Thus re-securing their account is the first thing they should do.
As for the 'on it's own' phrase it is often used when the trade is sent to someone other than who the user intends. API scam to a impersonator account. So it becomes by a scammer/phisher/hijacker that the user has no knowledge off.
Try your steps with your own auth. Are you locked out?