pip vs python -m pip?
> you must be picking up pip from a different python install (or virtualenv) than you are picking up python.
> Check your %PATH%
That was our first guess. Only one version of Python installed on the system (we install on an empty, freshly serviced pack Windows VM). Only one version of python*.exe found via Explorer.
This behavior observed across multiple Windows 2016 Enterprise servers and Windows 10 Professional desktops.