aruco_detect, can't access fiducial_id

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Hello, I'm trying to acces the fiducial_id in aruco_detect, but I get this error message:

error: ‘fiducial_msgs::FiducialTransformArray_<std::allocator<void> >::_transforms_type’ {aka ‘class std::vector<fiducial_msgs::FiducialTransform_<std::allocator<void> >, std::allocator<fiducial_msgs::FiducialTransform_<std::allocator<void> > > >’} has no member named ‘fiducial_id’
   25 |     h.transforms.fiducial_id;

I'm not sure why it's saying this, because it should be there according to this:

>rosmsg info fiducial_msgs/FiducialTransformArray 
std_msgs/Header header
  uint32 seq
  time stamp
  string frame_id
int32 image_seq
fiducial_msgs/FiducialTransform[] transforms
  int32 fiducial_id
  geometry_msgs/Transform transform
    geometry_msgs/Vector3 translation
      float64 x
      float64 y
      float64 z
    geometry_msgs/Quaternion rotation
      float64 x
      float64 y
      float64 z
      float64 w
  float64 image_error
  float64 object_error
  float64 fiducial_area

This how where I'm trying to access it:

#include "ros/ros.h"
#include <iostream>
#include <fstream>
#include "fiducial_msgs/FiducialTransformArray.h"
using namespace std;


void counterCallback(const fiducial_msgs::FiducialTransformArray::ConstPtr msg){

    int update_time;
    ROS_INFO("Hello");

}

int main(int argc,char **argv){
    ros::init(argc,argv,"marker_detect");/*Initialiserer node med navn*/
    ros::NodeHandle n;

    ros::Subscriber sub = n.subscribe<fiducial_msgs::FiducialTransformArray>("fiducial_transforms",10,counterCallback);
    fiducial_msgs::FiducialTransformArray h;
    h.transforms.fiducial_id;

    ros::spin();
    return 0;
}