I noticed that some Enscape proxies, people so far for me, are not rendering with VRay. Is this a bug or a limitation of the rights use of the models?
This is not a bug. All Enscape assets are supported apart from Enscape 3D People
You are welcome to find a complete list of the non-supported assets here.
I can see that the two assets rendered in V-Ray are not on the list.
That’s a bummer. An expanded people library was one one of the exciting aspects of being able to use Enscape assets. You can never have enough people assets.