Comment (by Erik Schnetter):

Yes, my cell phone lists “lsu.edu” as “Common Name” of the “Subject Name” of the certificate.

It seems “lsu.edu” is the certificate name. This might just be a string that looks like a URL (maybe it could be just “LSU” instead).

I also see “lsu.edu” and “*.lsu.edu” as “DNS Name” in the “Subject Alternative Name” (on my phone).

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2536/certificate-for-https-cactuscodeorg-is-not