GetNativeTexturePtr access violation

Unity Engine
1

I have a RenderTexture and get the Native Pointer via .GetNativeTexturePtr().
When I try reading from the address of the pointer I get an access violation.
Do I have to tell Unity that I want to use it to acquire access or is there something else wrong?
(Using DirectX11 by the way)

2

Are you sure you are accessing the native texture in the right context? We followed the example linked at the bottom of Unity - Manual: Low-level native plug-in interface and got it working for the same sort of scenario.

3

Is this possible without using c++ (just using c#)?