This is a common problem.
The issue is most likely caused due to Python not having its certificates installed.
Since Python 3.6, Python no longer uses the Apple OpenSSL certificates, meaning it requires its own certificates to be installed.
However, the official Python installation comes with a script for installing the certificates; instructions here
As for Windows, I would assume that the issue is similar (I haven't checked).
Changing it to +ssc makes it so that the certificate is not checked; it's just a workaround which is not really worth it.
By installing the certificates, you will be able to use +s, as initially intended.