Load C# dll from C++

I am trying to load a C# dll in C++. I have done this before with success and have shared a snip of the code that works and the code that doesn't. I will give you the dll files and the batch file I used before which successfully registered the dll that worked. The deliverable is a Visual Studio C++ project that succesfully loads the DLL so I can use it. Attached is source code snippet which which has the code that works and the one that doesn't When I try to run this code I get a 'not registered error'