SSL Certificates are issued and provided for free by Let's Encrypt.
When adding a domain name or subdomain there may be a delay for SSL Encryption to take effect. Let's Automatically runs on the server periodically adding security certificates to domains via a cron job. If your domain is not showing up correctly don't worry, the Let's Encrypt SSL Certificate will be issued soon.
Don't forget you may have to navigate to you control panel to SSL Status and check SSL redirection for SSL certificate to be applied on some occasions if not applied automatically.