Could that be the cause?
02f4:warn:select_vk_format: Failed to find Vulkan swapchain format for DXGI_FORMAT_R10G10B10A2_UNORM.
02f4:warn:d3d12_swapchain_create_vulkan_swapchain: Swapchain dimensions 4032x2240 are not supported (2560-2560 x 1080-1080).
Nothing extracted yet.
Compatibility Report
System Information
I confirm:
Symptoms
Game doesn't start in VR. Even in-game, when choosing the option "Enable VR", the game screen starts responding to headset motion, but still appears only in the flatscreen instead of inside the HMD.
Reproduction
steam-1140100.log