Everything seems to be working fine for me. I am not certain where you are hitting an error here. This might be a better question for the Yammer group. Can you check the network tab of your browser? Maybe the request is bad or there is some kind of access error.
Community Support Team _ Alex Rezac If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.
Just to double check, when you say it works fine to you, did you also log in using a Torus debug account? The Custom Connector feature didn't respond only when I logged in using the debug account, from where the environment is switched to point to Torus. Logging in with the regular Microsoft account is fine.