I setup a C++ Project for a quick test and followed your instructions, the only difference i believe being my project was called TWITCHCHAT_API when yours was called TWITCH_TEST_API
However when run the code from VS it opens the editor but when I play there are no messages in the output log regarding the codes actions.
I made sure to override the Gamemode with my new test gamemode file that I created.
I Changed the OAUTH and TwitchName for my Pass and Name respectively, do i need to remove the words that say PASS and NICK?