Hope you’ve solved this problem.
I had same problem and solved it as below.
- download cacert.pem from github(https://raw.githubusercontent.com/certifi/python-certifi/master/certifi/cacert.pem)
- set environment variable in your computer(SHOTGUN_API_CACERTS=“the cacert.pem path”)
- restart your maya session
Using Shotgun Desktop behind an firewall with SSL introspection