federated-wordpress-customizations/woocommerce/new_subscription_set_to_needs_provision.php

<?php

if( ! defined( 'ABSPATH' ) ){
    exit; // Exit if accessed directly.
}

function federated_set_new_subscription_provision_status($subscription){
	update_field('provision_status', 'needs_provision', $subscription->ID);
}

add_action('woocommerce_checkout_subscription_created', 'federated_set_new_subscription_provision_status');