This is a really odd issue, I pulled the curl request out of the API documentation and plugged it into Postman to test from my desktop (I am able to ping CML Dashboard from local PC), and the response I get is 200 OK however it is empty and Postman shows a little red error in the bottom right corner about a "self signed certificate in the chain" issue.
I tried changing Auth to Basic and using my admin creds instead of a Bearer token but that gave a 4xx response so I changed it back, I am not sure at all where to get or what info I need to pull from CML to get this to work - Any input very appreciated!