I've deployed a basic example .m to DLL but the function not found by the target system

I am trying to create a very simple DLL with one function (as a test)

i.e. in Matlab:

function x = addOne(y)
x = y+1;

I have tried this: mcc -v -W cpplib:libAddOne -T link:lib addOne and the deploytool. When I tried the deploytool I added the 'addOne.m' to the "exported functions"

When I try to access this function via the DLL through another piece of software I get an error that says it can't find my function.

What else do I need to do to link the function to the library ? (if I were using C++ I would use a module definition file, can I do that with matlab/deploytool ? if so , how?

e.g. if using MS Visual C++ I include a source file libAddOne.def that contains:

LIBRARY libAddOne
EXPORTS
  addOne

Also I am using a 64 bit machine, will my DLL be 64bit by default?