Issues with Python & SMS demo app

Hi folks,

I am juuuust getting started with RingCentral & Python, trying to run the sms.py sample app. I filled out .ENV as required, however, cannot run sms.py without error. I get the error:

Unable to authenticate to platform. Check credentials. Either code, or username with password, or jwt has to be provided

I have provided username, password, Client ID, etc. in .ENV and it is as if the script is ignoring it. I see a line of the script that says:

platform.login(jwt=os.environ.get('RC_JWT'))

which leads me to belive this sample .py file defaults to using JWT authentication? If so, how do I change it? If not, what might be wrong with my implementation?

Thank You!