This is my LetsEncrypt Log. The error I am getting has been marked in bold letter.
s6-rc: info: service s6rc-oneshot-runner: starting
s6-rc: info: service s6rc-oneshot-runner successfully started
s6-rc: info: service fix-attrs: starting
s6-rc: info: service fix-attrs successfully started
s6-rc: info: service legacy-cont-init: starting
cont-init: info: running /etc/cont-init.d/file-structure.sh
cont-init: info: /etc/cont-init.d/file-structure.sh exited 0
s6-rc: info: service legacy-cont-init successfully started
s6-rc: info: service legacy-services: starting
services-up: info: copying legacy longrun lets-encrypt (no readiness notification)
s6-rc: info: service legacy-services successfully started
[10:35:28] INFO: Selected DNS Provider: dns-cloudflare
[10:35:28] INFO: Use propagation seconds: 60
[10:35:29] INFO: Use CloudFlare token
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Requesting a certificate for home.agrahost.com and *.home.agrahost.com
Encountered CloudFlareAPIError adding TXT record: 10000 Authentication error
Error communicating with the Cloudflare API: Authentication error
Ask for help or search for solutions at https://community.letsencrypt.org. See the logfile /var/log/letsencrypt/letsencrypt.log or re-run Certbot with -v for more details.
s6-rc: info: service legacy-services: stopping
s6-rc: info: service legacy-services successfully stopped
s6-rc: info: service legacy-cont-init: stopping
s6-rc: info: service legacy-cont-init successfully stopped
s6-rc: info: service fix-attrs: stopping
s6-rc: info: service fix-attrs successfully stopped
s6-rc: info: service s6rc-oneshot-runner: stopping
s6-rc: info: service s6rc-oneshot-runner successfully stopped
Oh, hm, I misinterpreted the post. I read it as it was Windows 10 running inside the VM Which doesn't make much sense for running HA so I was puzzled. But not puzzled enough to think any further