Stuck on trying to issue a certificate. Error: The client lacks sufficient authorization

I have been trying certbot to issue a certificate, but the challenge keeps failing. I also made a .well-known/acme-challenge available through nginx settings. Nothing seems to be working.

My domain is: posherry.com

I ran this command: sudo certbot certonly --nginx -d posherry.com -d www.posherry.com --dry-run --webroot- path /var/www/html

It produced this output:

Failed authorization procedure. posherry.com (http-01): urn:ietf:params:acme:error:unauthorized :: The client lacks sufficient authorization :: Invalid response from http://posherry.com/.well-known/acme-challenge/PICPsfGsrWq8aNkpnJ9Ms7Kc_g_UlDWQRbKOjaSCCIw: "<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width,initi"

IMPORTANT NOTES:
 - The following errors were reported by the server:

   Domain: posherry.com
   Type:   unauthorized
   Detail: Invalid response from
   http://posherry.com/.well-known/acme-challenge/PICPsfGsrWq8aNkpnJ9Ms7Kc_g_UlDWQRbKOjaSCCIw:
   "<!DOCTYPE html>
   <html lang="en">
     <head>
       <meta charset="utf-8">
       <meta name="viewport" content="width=device-width,initi"

   To fix these errors, please make sure that your domain name was
   entered correctly and the DNS A/AAAA record(s) for that domain
   contain(s) the right IP address.

My web server is (include version): nginx/1.14.0

The operating system my web server runs on is (include version): Ubuntu 18.04

My hosting provider, if applicable, is: DigitalOcean

I can login to a root shell on my machine (yes or no, or I don’t know): yes

I’m using a control panel to manage my site (no, or provide the name and version of the control panel): SSH, no control panel

posherry.com.  (insecure)  3574  A     139.59.46.65
posherry.com.  (insecure)  1774  AAAA  2604:a880:400:d0::ab3:1001

Is posherry.com's IPv6 address correct?

Apparently not. just fixed it and it worked like a charm. Thank you so much. You have fixed in minutes what took me an entire day of head scratching and failing. Thank you :smile:

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