Doxygen skip ifdef

Question

I am using doxygen to document my code and I have one concern. I want doxygen to record and disclose the header files. I am using ceedling for my unit tests and I often have to add helper functions for the test code to gain access to data. One of my doxygen headers is as follows.

#ifndef INCLUDE_THREAD_HEALTH_H_
 #define INCLUDE_THREAD_HEALTH_H_
  
 #include <stdbool.h>
 #include <stdint.h>
 #include <pthread.h>
  
 #define MAX_TRACKED_THREADS 100U
  
 struct thread_health {
     bool thread_alive;          
     char* thread_name;          
     pthread_t* thread;          
 };
  
 void thread_health_init(void);
  
 int32_t thread_health_create_and_register_thread(pthread_t* thread, pthread_attr_t* attributes, char *thread_name, void *(*ThreadTask) (void *));
  
 bool thread_health_destroy_unregister_thread(const pthread_t* thread);
  
 void thread_health_task(uint32_t period);
  
 #ifdef CEEDLING_TESTS
 struct thread_health thread_health_get_health(uint8_t index);
 #endif
  
 #endif /* INCLUDE_THREAD_HEALTH_H_ */

I have the ifdef macro, I want doxygen to ignore everything in this macro. I cannot seem to find a way to do this.

Edit: Adding doxygen info

# Difference with default Doxyfile 1.8.17
PROJECT_NAME           = "MAIN Application"
JAVADOC_AUTOBRIEF      = YES
OPTIMIZE_OUTPUT_FOR_C  = YES
RECURSIVE              = YES
EXCLUDE_PATTERNS       = */build/* \
                         */test/*
MACRO_EXPANSION        = YES

My hope was to find an undef option. But that does not seem to exist in Doxygen.

Edit 2: My defined value for my ceedling test helper functions is CEEDLING_TESTS. I would like it if Doxygen could not report the function declarations between this tag.

Edit 3: I found this in a FAQ Unfortunately this is not working for me, it may be a version issue. I cannot find a version for the FAQ but I will attempt to update.

Edit 4: I updated to doxygen 1.9.4 following this guide. Same issue.