It turned out that, after digging deeply into the issue, my domain registrar does not support DNS_NSupdate RFC2136. So, I switched name server to Cloudflare and after a few stumble, got my certificate...wipe off sweat for lots of reading, swearing, and more reading.
[Fri Feb 18 13:04:37 CST 2022] Your cert is in /tmp/acme/nollivoipserver_cert//nollivoipserver.nollicomm.net/nollivoipserver.nollicomm.net.cer
[Fri Feb 18 13:04:37 CST 2022] Your cert key is in /tmp/acme/nollivoipserver_cert//nollivoipserver.nollicomm.net/nollivoipserver.nollicomm.net.key
[Fri Feb 18 13:04:37 CST 2022] The intermediate CA cert is in /tmp/acme/nollivoipserver_cert//nollivoipserver.nollicomm.net/ca.cer
[Fri Feb 18 13:04:37 CST 2022] And the full chain certs is there: /tmp/acme/nollivoipserver_cert//nollivoipserver.nollicomm.net/fullchain.cer
[Fri Feb 18 13:04:37 CST 2022] Run reload cmd: /tmp/acme/nollivoipserver_cert/reloadcmd.sh