SSL Related Errors Testing Fresh Python 3.6.6 Installation

I am trying to compile from source Python 3.6.6 on my Debian buster linode. The config && make altinstall works, but running python3.6 -m test fails with SSL certificate related errors.

The complete description is on Stackoverflow - https://stackoverflow.com/questions/63982543/ssl-related-errors-testing-fresh-python-3-6-6-installation

Any suggestions will be greatly appreciated!

Mark