Thank you, very nice thing to have.
I wonder why is it disabled by default for reseller accounts? It makes it necessary then to create and associate a package in order to use this feature.
And I was avoiding using packages because each time WHM is updated it automatically recreates all the default subdomains for each account, and I had to manually delete the ones I don't want...
Can I ask how long it takes to start working? I have installed on two websites but there is no change, do I need to change anything else on my websites to make it work?
For me it was instantaneous.
You can check your website manually appending https:// before the address and see if it works. If it does you could create a redirection at the domain level, or if it's a WordPress site, for example, there are plugins that can manage the redirection themselves also.