UMDF DXGI Resource sharing

Hey there!
I'm developing a User Mode Driver (UMD) based on the Microsoft Indirect Display Driver Sample and want to share a D3D11 texture with real-time user-mode processes. However, when a client process tries to open the shared resource, OpenSharedResource fails with E_INVALIDARG.

The same code works on two regular processes.

Is it possible at all? Will I need a Kernel driver as well?