I've spoke too soon. Well.. one domain for some reasons it not working. All other domains created certificates fine but only one.
I've unchecked these too.
Force Redirect 'domain.com' To 'www.domain.com'
Force Redirect 'http' To 'https'
I even (_).htaccess [now deleted too]
Make sure no redirects on cp and domain.
And even deleted everything in the domain but one image (logo) and an index.html for coming soon. That's it for that domain (now).
I rebuilt the DNS too.
Nothing work. Kept getting:
Create Certificate failed