I created a site and added a Let's Encrypt certificate to it (mydomain.com). I did that through my hosting provider (dinahosting) interface (a few clicks). I dont have root shell access here.
Now I want to create a subdomain. Lets say mysub.mydomain.com. That subdomain is hosted in another different machine where I do have root shell access.
My doubt now is:
Do I have to create a new different certificate from scratch? Or do I have to modify (expand) the original one? (In this last case, how?)
What is the easiest way in my case?