function test_init() {
acf_add_options_sub_page(array(
'title' => 'SEO',
'slug' => 'acf-options-module-seo',
'parent' => 'options-general.php',
'capability' => 'manage_options'
));
}
add_action('init', 'test_init');
I’m using this to load the module before ACF and their add-ons has completely loaded.