Error with https://msopentech.com/blog/2014/08/06/wait-for-it-http2-begins-working-group-last-call/

exception = HTTPSConnectionPool(host='msopentech.com', port=443): Max retries exceeded with url: /blog/2014/08/06/wait-for-it-http2-begins-working-group-last-call/ (Caused by SSLError(SSLCertVerificationError(1, "[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: Hostname mismatch, certificate is not valid for 'msopentech.com'. (_ssl.c:992)")))