SSL certificate for Domain Pointers, how to make it right?

[sgala]

Have started moving sites to https and it almost goes good.
But I have no clue how to install SSL certificate for domain pointer.

Let's see. I use let's encrypt certificate
https://maindomain.com - ssl installed, works good
http://maindomain.com - works good, also I can make redirect to https which works good to.
But also I have "pointer.com" which points to maindomain.com
And if I type "https://pointer.com" then I god "error ssl certificate error", which is enough obvious since no SSL installed.
But on SSL certificates menu I can generate/install SSL certificate for current domain, but not for domain pointer.
At least it looks so.

Any ideas?

 

[scriptkitty]

What error do you get trying to install SSL for the domain pointer?