When I log in to gitnotebooks I get the option of whether to use my personal account or to log in to one or my organisations:
If I log in using the org, I can see all the org repos and work normally. However, if I select my personal account then no repos (neither publick nor private) show up in the next screen:
This is preventing me to use gitnotebooks for reviewing PRs that don't belong to org repos (typically, repos associated to "paper with code" research that live in some academic's personal account)