register-all-taxes.php

<?php
/**
 * Include all non-core taxonomies in the sync request, limiting by publicly queryable.
 *
 * @param array The list of existing taxonomies.
 * @return array The new array list.
 */
function sync_non_core_taxonomies( $taxonomies ) {
	$taxes = get_taxonomies();
	foreach ( $taxes as $taxonomy ) {
		$tax = get_taxonomy( $taxonomy );
		if ( $tax->publicly_queryable ) {
			$taxonomies[] = $tax->name;
		}
	}
	return $taxonomies;
}
add_filter( 'ep_sync_taxonomies', 'sync_non_core_taxonomies' );