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:eiuf.app
I ran this command: certbot certificates
It produced this output:
Found the following certs:
Certificate Name: eiuf.app-0001
Serial Number: 4cb137e1bbeee630c3a416137ac5cef57cb
Domains: eiuf.app
Expiry Date: 2021-02-07 16:04:38+00:00 (VALID: 89 days)
Certificate Path: /etc/letsencrypt/live/eiuf.app-0001/fullchain.pem
Private Key Path: /etc/letsencrypt/live/eiuf.app-0001/privkey.pem
Certificate Name: eiuf.app
Serial Number: 4b8d5ecd742b29da3b22e6b53b4e83aa51c
Domains: eiuf.app www.eiuf.app
Expiry Date: 2021-02-07 16:12:31+00:00 (VALID: 89 days)
Certificate Path: /etc/letsencrypt/live/eiuf.app/fullchain.pem
Private Key Path: /etc/letsencrypt/live/eiuf.app/privkey.pem
My web server is (include version):Apache
The operating system my web server runs on is (include version):
CentOS 8
The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot):certbot 1.9
Here's (part) of your problem: your hostname is configured in two configuration files. The ssl.conf probably has preference, but without the correct certificates used.
The other part which I already pointed out in a previous post is the lack of certificate configuration for your www subdomain to base domain redirect on port 443.