Refresh Python Script Datasource via Personal Gateway error

I cannot for the life of me figure out how to get my python script datasoruce to refresh in power bi service via a personal gateway.

I am using:

• A seperate anaconda power bi env (python 3.6) with all the required packages
• I've configured power bi desktop to point to this installation by selecting other and then routing to the path
• Dataset/dataframe loads and works in desktop
• After publishing to the service I try to configure the datasource credentials but get the following error:
• August Versions of both Desktop and Personal Gateway (Fresh Install)

"Failed to update data source credentials: ADO.NET: Python installation not found. A Python installation wasn’t found in this location. Please follow the instructions provided in the “How to install Python” link to install Python. If Python is installed and this message persists, provide the installation path in the dialog."

In the box below is:

extensionDataSourceKind: Python

extensionDataSourcePath: Python

Authenticaiton method: WindowsWithoutImpersonation

Privacy Setting: Public

Questions

1. The error message seems to indicate that I should be able to provide the installation path in the dialoge but what dialgue is that?  The extensionDataSourcePath field is grayed out?