Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. https://crt.sh/?q=example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.
My domain is: nb.dc-smarter.com
I ran this command: sudo certbot --nginx
It produced this output: Certbot failed to authenticate some domains (authenticator: nginx)