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Sounds like you trying to login to scam site, and if it is the moment you do they try to trade all your items, auto refund anything recently, and spend it on their items at a mark up to take the funds.
If your mobile app is asking for a SteamGuard code, then you already have a device set as your designated auth device.
its the biggest trading site in team fortress 2, the only thing it gets is your steamID, it requires you to log in through steam just like any other trading websites like tradeit.gg, backpack.tf etc
well it used to be my phone but then i uninstalled the steam app, and when I reinstalled it and tried to log back in again, this happened
Also my advice visit https://steamcommunity.com 1st go to it MANUALLY, don't let 3rd party sites do it for you, there LOTS of scam sites online that make fake pages, and scripts with fake pages inside the browser to trick you thinking it your browser tab.
Login on https://steamcommunity.com/ then go visit 3rd party site, it SHOULDN'T be asking for login details period, it should display your profile with green button below that say sign in that it, there no text build field to enter any kind of text, that the point because you're already sign into the steam. Should look like this.
https://steamcommunity.com/sharedfiles/filedetails/?id=2338543075