I'm trying to create an Azure Pipeline (using the classical interface) that should checkout a private Github.com Enterprise repository (in an organization under https://github.com/enterprise), but Azure does not find any repository:

I have tried with both Oauth authentication and with a PAT with repos scope. Even with the Load all repositories button, Azure always says No repositories found.
Trying to type the / directly in the field does not work either, as the field is still marked in red with This setting is required.
Any idea?

