Multisite SSL Issue

How would one go about adding a new subdomain to the SSL certificate of a site? I created the site https://example.com and tried to add https://sub1.example.com. This site works but I get the SSL warning when I go to the new site.

I tried syncing the domains to the host file, but does this added the new sub-domain to an already created certificate?

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Not sure if this would work, but it seems to me you could try modifying the apache virtualhost conf file (or nginx) to specify aliases and wildcard domain. Something like:

# 443 is default port for serving https, yours could be different

ServerName example.com
ServerAlias www.example.com *.example.com