Plugin reCaptcha for WooCommerce  adds extra verification.


please, use following code to disable in Phone Orders


add_filter('wpo_before_create_customer', function($data) {
  global $i13_woo_recpatcha;
  remove_action('woocommerce_register_post', array($i13_woo_recpatcha, 'i13_woocomm_validate_signup_captcha'));
  return $data;
});

add_filter('wpo_after_create_customer', function($data) {
  global $i13_woo_recpatcha;
  add_action('woocommerce_register_post', array($i13_woo_recpatcha, 'i13_woocomm_validate_signup_captcha'), 10, 3);
  return $data;
});