What you describe sounds valid, but not complete
So what you need to do is first set the MCC value for the track (which is the valid part and which you have done), but then you need to send the values from the appropriate steps that will make the actual MCC change.
Now take a step of your choice and modify its MCC value. When that step is played, you should hear the MCC message being sent. Repeat the procedure as needed and let us know if it worked out.