I’m glad that fixed it for you. The only situation I’ve run into where automatic updates are not available are when the site is part of a “multi-site” WordPress installation. Because of how those differ from individual WordPress sites, the update feature can’t work.
It may be possible that there is another situation that prevents it, but I haven’t encountered it yet. If your server isn’t running a multi-site installation, then I’m afraid I don’t know what is prohibiting the update notices.
The update system is not a creation of my own, but I do keep up with its development. When updates are made to the system I do implement them. Since he works with many developers he has a good idea of limitations and works to overcome them.
If I can help, let me know,
Bill