If the basic steps don't work, try these system-level adjustments:
He checked his taskbar. Steam was there, but it was stuck in an infinite update loop, a tiny green bar crawling across the screen like a dying slug. He tried to launch the game again. The same error popped up. It felt like a taunt from Mundus himself—a digital seal more effective than any magical barrier.
However, the issue arises when Steam is indeed running, and the player has a stable internet connection. In such cases, the error message still appears, preventing the player from accessing the game. This error has been reported by numerous players on Steam forums, Reddit, and other online platforms, with no clear solution in sight.
However, many players attempting to launch the game via Steam, a desktop shortcut, or even after modding encounter a frustrating roadblock:
Aggressive antivirus programs (like Avast, McAfee, or even Windows Defender’s "Controlled Folder Access") can quarantine the steam_api.dll file responsible for verifying your ownership.