Incomplete authorizations when requesting certificates for domains using CNAME record

My domain is: www.matrixautosales.com(domain for which cert is requested) which CNAME to app.motorlot.com

I ran this command: letsencrypt certonly --standalone --noninteractive --agree-tos --email "myemail@gmail.com" -d www.matrixautosales.com" (This command was ran by ansible(provisioning tool) on both EC2 instances)

It produced this output: Incomplete authorizations

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

The operating system my web server runs on is (include version): ubuntu 16.04

My hosting provider, if applicable, is: Aws

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