I tried to put the command to get the certificate but it gave me this error:
An unexpected error occurred:
The server will not issue certificates for the identifier :: Error creating new order :: Cannot issue for "ec2-34-237-242-160.compute-1.amazonaws.com": The ACME server refuses to issue a certificate for this domain name, because it is forbidden by policy

>Solution :

Let’s Encrypt blocks Amazon AWS domains because the domain names are transient and are subject to change.

https://community.letsencrypt.org/t/policy-forbids-issuing-for-name-on-amazon-ec2-domain/12692/4