: Some users find that the game fails to initialize with DX12 enabled. In the game's launcher preferences, uncheck DirectX 12 to force DX11 mode.
The "Failed to initialize Steam" error for Shadow of the Tomb Raider is a rite of passage for PC gamers—a frustrating, cryptic, but ultimately solvable problem. In 99% of cases, the solution is either or restoring the steam_api64.dll file via antivirus exclusions.
The "Holy Grail" workaround that saves you from a reinstall. Difficulty: Easy (Intermediate if you have to edit config files). Success Rate: 9/10.