I found the answer here:
- If the install uses FTP for updates (and prompts for credentials),
automatic updates are disabled. (I found this answer which will tell you how to avoid using FTP.) - If the install is running as a SVN or
GIT checkout, automatic updates are disabled - If the constants
DISALLOW_FILE_MODS or AUTOMATIC_UPDATER_DISABLED are defined,
automatic updates are disabled - If the constant WP_AUTO_UPDATE_CORE is
defined as false, automatic updates are disabled - Your WordPress
install also needs to be able to contact WordPress.org over HTTPS
connections, so your PHP install also needs OpenSSL installed and
working - Wp-Cron needs to be operational, if for some reason cron
fails to work for your install, Automatic Updates will also be
unavailable
This plugin will test these things for you.
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