Hello,
I just installed the lastest version (2.2), but the issue with accessing the subdomain over https still exist. After contacting the SiteGround, the told me that it is necessary to create a symlink to get this working with your plugin.
Support answer from SiteGround:
In case you have any similar sub domain names that are virtually linked to posts inside your website, for them to work with SSL, you need to create symlink for each sub domain name.
example page
https://domain.com/mypage
needs a symlink in the root of domain.com
ln -s . mypage
after that I can access the page by
https://mypage.domain.com
Is this something you can solve in your plugin?
Regards,
Walter Kamer