Can I use a wildcard certificate for a sub-subdomain?

I have a domain, example.com. I installed a wildcard certificate for *.example.com, and I'd like to use it for sub.sub.example.com. Is this possible?

Answer

Unfortunately, wildcard certificates, due to Domain Control Validation requirements, cannot function on subdomains of subdomains.

However, if you're using AutoSSL, it will automatically generate the best coverage possible with your configuration.

Resources

RFC 2818

How to convert to the cPanel-provided plugin for Let's Encrypt