How to add a domain to an existing set of certs using acme.sh?

Can you see the newly reissued cert in cPanel?

Yes, absolutely.
To be clear, though, you could always "see" the problem domain (starsandstrife.com) in cPanel (under " Manage Installed SSL Websites" > FQDNs (there's a long list). In that list was the problem domain.

But below in cPanel where you "Browse Certificates" and choose the main domain and then "Autofill by Domain" -- that was the moment of failure: the "problem domain" didn't appear, and indeed when going to that domain in a web browser the certificate failed.

That's what you're "guess" (i.e. ./acme.sh --renew [main.domain] --deploy-hook cpanel -f) fixed

Genius, batman. You deserve a cape.

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