The most common reason is the graphics card installed on your computer. If your graphics card doesn’t support it or it is pretty old, you cannot use DirectX 12 on your computer.

Resetting the graphics driver on your PC might be the solution to a bevy of issues or inconsistencies, but the process to do so isn't commonly known.

To fix the graphics card problem, uninstall the currently installed GPU driver and install its latest version available on your computer manufacturer’s website.