Root domain redirected to wp-signup.php?new=example.com

I recently moved files and db from 1 cPanel account to another, so I had to update the path, as example.com was now an add-on domain, rather than the primary domain.

However, now http://example.com redirects to https://example.com/wp-signup.php?new=example.com

This is my wp-config.php:

define(‘WP_ALLOW_MULTISITE’, true);
define(‘MULTISITE’, true);
define(‘SUBDOMAIN_INSTALL’, true);
define(‘DOMAIN_CURRENT_SITE’, ‘example.com’);
define(‘PATH_CURRENT_SITE’, ‘/’);
define(‘SITE_ID_CURRENT_SITE’, 1);
define(‘BLOG_ID_CURRENT_SITE’, 1);
define(‘ADMIN_COOKIE_PATH’, ‘/’);
define(‘COOKIEPATH’, ”);
define(‘SITECOOKIEPATH’, ”);
// define(‘COOKIE_DOMAIN’, $_SERVER[ ‘HTTP_HOST’ ] );
// define(‘SUNRISE’, ‘on’);

Help appreciated.
Steve