Invalid response: challenge failed

My domain is:

I ran this command:

It produced this output:

### Creating dummy certificate for ...
Generating a RSA private key
writing new private key to '/etc/letsencrypt/live/all/privkey.pem'

### Starting nginx ...
Recreating openmappr_nginx_1 ... done                                                                                                                                                                              
### Deleting dummy certificate for ...

### Requesting Let's Encrypt certificate for ...
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator webroot, Installer None
Obtaining a new certificate
Performing the following challenges:
http-01 challenge for
Using the webroot path /var/www/certbot for all unmatched domains.
Waiting for verification...
Challenge failed for domain
http-01 challenge for
Cleaning up challenges
Some challenges have failed.

 - The following errors were reported by the server:

   Type:   unauthorized
   Detail: Invalid response from
   []: "<!DOCTYPE html>\n<html
   GET /.well-known/"

   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 (Docker image: nginx:1.15.1:1.15.1)

The operating system my web server runs on is (include version): Amazon Linux 2 AMI

My hosting provider, if applicable, is: Dreamhost

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): No

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you’re using Certbot): Docker image: certbot/certbot

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