A test authorization for cdo-tst.lenovo.com to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
Fetching http://cdo-tst.lenovo.com/.well-known/acme-challenge/MwDoNmiCyronYIIF2idfyjn2HqWdpvaO_iSDpka8n_Y: Timeout during connect (likely firewall problem)