Authenticating users with an NGINX SSL certificate?

Question

Nginx

There is such a task: there is a website site.com, an ssl certificate from godaddy is installed on it, the simple.site.com sub domain is raised, that's just for the simple.site.com sub domain, you need to make access only if you have an ssl certificate that I generate on the server (I tried to do according to this article, everything was unsuccessful https://habrahabr.ru/post/213741/).
Another such moment, I read a lot of comments, I came across the fact that nginx cannot resolve it like that, in general, the trouble is for some second day I try to make such access, but when I curl it gives an error: 400 Bad Request
No required SSL certificate was sent

Answer 1

Was the client certificate signed with the same CA certificate as the site certificate?