IECSClient::CreateInstance not implemented

[ipraveenMS]

Developing in C++ Windows 11 Enterprise environment. I built the latest 1DS SDK and linked my exe. I am getting the linker error

auto ecsClient = Microsoft::Applications::Experimentation::ECS::IECSClient::CreateInstance();
if (ecsClient == nullptr)
{
throw std::runtime_error("Could not create EcsClient");
}

Main.obj : error LNK2001: unresolved external symbol "public: static class Microsoft::Applications::Experimentation::ECS::IECSClient * __cdec
l Microsoft::Applications::Experimentation::ECS::IECSClient::CreateInstance(void)" (?CreateInstance@IECSClient@ECS@Experimentation@Applications
@microsoft@@SAPEAV12345@XZ)

I checked the 1DS SDK code and only see the declaration of IECSClient::CreateInstance. Nowhere I see the implementation.