{“error_description”: “Invalid Client Id”, “error”: “invalid_client”} for postman. How to connect to Collab Tech preview using REST API | Blackboard

Question

I want to do a rest api test with Postman. The steps I need to follow are written at https://github.com/blackboard/BBDN-Collab-Postman-REST and https://www.youtube.com/watch?v=-