Unable to run a notebook from mybinder, but it works starting from gesis

Hi,
I cannot run this https://mybinder.org/v2/gh/aborruso/my-binder/HEAD

But if I start from here https://notebooks.gesis.org/binder/ and paste in it the same repo binder url https://github.com/aborruso/my-binder, I’m able to run it.

And then I’m not able to share a working starting URL like this:
https://mybinder.org/v2/gh/aborruso/my-binder/HEAD