Configure SSL on cPanel

I need help configuring SSL for my websites on a dedicated server using cPanel. Some sites are working fine with HTTPS, while others are showing SSL not accepted on all subdomains.

Requirements:
- Configure free SSL (Let's Encrypt) on cPanel
- Fix SSL issues for all subdomains
- Experience with cPanel and SSL certificate management

Ideal Skills:
- Proficient in cPanel
- Strong knowledge of SSL and Let's Encrypt
- Experience with dedicated servers and subdomain configuration

Please ensure the SSL is properly set up so that all sites and subdomains are secure.