Do you get any output on any preview setting with r.VRS.DebugForceRate 3? That should force 2x2 rate VRS globally, which should also be noticeable in editor without preview, on the off chance it’s a preview issue.
If that isn’t working, it might be worth confirming that D3D12 SM6 is in use rather than SM5. I haven’t checked Vulkan, but it does appear to have VRS extensions, so VK SM6 may also work.