'subscription-manager' fails to register with 'ssl' error

Issue

• subscription-manager fails with the following error when trying register.

# tail /var/log/rhsm/rhsm.log
..
2020-04-03 10:43:28,964 [INFO] subscription-manager:99163:MainThread @dmiinfo.py:73 - Using dmidecode dump file: /dev/mem
2020-04-03 10:43:29,492 [ERROR] subscription-manager:99163:MainThread @managercli.py:177 - ?~S??~] ?~O~D?~Q ?~X??~X ?~\?~C~]: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify faii
led (_ssl.c:579)
2020-04-03 10:43:29,493 [ERROR] subscription-manager:99163:MainThread @managercli.py:178 - [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:579)
Traceback (most recent call last):
..

• The system is connected to internet and 'subscription.rhn.redhat.com' is pingable