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.
The instructions should be updated then: had the same problem and this solved it. Using v 2.1.4 Beta
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.