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It produced this output: Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator nginx, Installer nginx
Obtaining a new certificate
Performing the following challenges:
http-01 challenge for www.nevarezfarmlabor.com
http-01 challenge for nevarezfarmlabor.com
Cleaning up challenges
Certbot could not find a block to include challenges in /etc/nginx/nginx.conf.
My web server is (include version): nginx/1.14.0 (Ubuntu)
The operating system my web server runs on is (include version): Ubuntu 18.04.4 LTS
@Osiris that indeed was the issue. Using both your explanation and @9peppe example I relocated the http portion into nginx.conf and included sites-enabled. The certs were then issued successfully. I must have modified the nginx.conf file when initially tinkering with config. Thanks for your help with this @Osiris and @9peppe.