There is no registry key created for Python version 3.6 in ArcGIS Pro when ArcGIS Pro is installed. Following the documentation here: https://pro.arcgis.com/en/pro-app/arcpy/geoprocessing_and_python/extending-geoprocessing-through-python-modules.htm, when running the foo set up wizard, an error is returned on the set-up page with the following warning,"No Python installation found in the registry".