Hi, Michael,
I have tried my MC56F84789 board, I can communicate with TWR-568400 board.
I suggest you try the following process so that we can confirm that the USBTAP device is okay.
1)after you connect the target board, sure that the USBTAP can be identified.

2)after you download the code, check the ccs tools:

3)If your USBTAP device has issue, pls consider the Multilink Universal device from the link, which supports the MWCT10xx family:
http://www.pemicro.com/
Hope it can help you
BR
XiangJun Rong