Deleting all internet cookies/history/passwords for the steam client browser, my local PC's browser, uninstalling/re-installing steam, checking port forwarding on my router, etc. I created a dummy account and was able to authenticate without any issues. A new window will pop up and youll want to add -licenseRecoveryTRUE into it. From there, click the Set Launch Options button under the General tab. I verified it was an account issue as I tried logging in even from my cell phone's browser without being connected to wifi so I could be sure I was using the cell network to rule out local network or client issues. If youre playing via Steam you should head to your library, right click on the game and select Properties. I could not submit a support ticket due to this problem as it would again try to do the login verification and say it could not reach a login server. Ive tried deleting my Klab id it was originally and linking it to a new account but that didnt work. Dont know if that helped but thats what I got. I'd authenticate and put in my steam guard code but it would just go back to the login page (steam client would authenticate and show me logged in). It let me make the account on klab and log in just gave the 'failed to verify account' message when I tried to link it because it kept sending me to my first account. If the above solution doesnt work, please verify.

In fact, in my case I could not even log in to steam via a browser. PC Restart the Steam app on your computer, including exiting out of the app via the Windows taskbar tray. You might have issues when you save, copy, or attach files. When you install this KB: This update addresses a known issue that affects 32-bit apps that are large address aware and use the CopyFile API. I was able to log in to steam from the client but my wishlist was inaccessible, I could not buy games due to the login verification popping up and failing, etc. This security update includes improvements that were a part of update KB5026446 (released May 24, 2023). In case anyone else is searching the web and finding all the solutions provided didn't work for them, I had a completely separate resolution: I had to remove steam guard and re-add it.

Steam fails to verify login information