Documentation shows these options for pip.conf:
[global]
index = http://localhost:8081/repository/pypi-all/pypi
index-url = http://localhost:8081/repository/pypi-all/simple
But in our OSS 3 nexus no such URL's are available and we can't find any python distributions. Must be missing something here.
twine upload-r nexus
Is working fine.
You might need to use the group url vs hosted/internal
http://nexus.example.com/repository/pypi-group/simple/