I had a similar error, I fixed it by making a shortcut of the .exe file and adding "-force -dx11 -dxd11" to the launch parameters
interesting. There should already be a shortcut that starts the game in dx11, below the .exe. Does it also work with that shortcut or only the new one described here?
edit: our shortcut did not have the -force, so if your PC supported dx12 it still took it. Thanks for letting us know we added the -force for future releases!