Prompty Authentication in Python runtime

[eightfold999]

Hi,
I have the prompty extension installed in VSCode and can open a .prompty file and run it successfully. It returns what I expect. When I try and run the same .prompty file in python in the same folder with the prompty.execute function I get
openai.AuthenticationError: Error code: 401 - {'error': {'code': 'PermissionDenied', 'message': 'Principal does not have access to API/Operation.'}}
I have added Cognitive Services OpenAI User and Contributor to all the accounts I think it might be using but I'm not logged into VSCode or the terminal and it does not prompt me for an account.

How can I tell which account its trying to use?
How do I specify credentials to run the prompty as?
Do I need to do anything specific in the python code? All the examples just show using execute with no authentication code?