Solved
CatLight is receiving an error after authorizing vsts for catlight.
I will be sending an email with the details and log to help debug this.
For the version 1.7.4 Beta, the collection url should not include the default collection for catlight to start working, just the protocol and domain (i.e. https://[account].visualstudio.com/), which is different than the connection tip specified.
Feel free to close this or make some fixes before closing this.
The instructions should be updated then: had the same problem and this solved it. Using v 2.1.4 Beta