How To Configure TTK Projects for GCC Development & Testing

Over the last year or so, I’ve worked with a few public-sector customers interested in developing custom apps for Microsoft Teams. These customer deployments don't reside within the commercial clouds most of us use; rather, they use the Government Community Cloud (GCC) and GCC High (for more secure scenarios). While Microsoft has made significant progress with the development tools we use to create custom apps for Microsoft Teams, the Teams Toolkit (TTK) has limitations regarding GCC and GCC...