Google Test class method can't access private member of user class (the class under test)

I would like the test fixture method utFooFixture::utMethod1 to access the private member Foo::m_fooProc.

I've followed the instructions and some other stack overflow advice to declare utFooFixture as a friend using the FRIEND_TEST macro but I still get an access error inside utMethod1. Why is this happening? The access is supposed to be enabled by defining the UNITTESTS preprocessor directive, which I have done for the project that contains Foo.h and for the unit test project that contains utFoo.cpp.

Foo.h

#ifdef UNITTESTS
#include <gtest/gtest_prod.h>
#endif
#include <Windows.h> // PROCESS_INFORMATION

class Foo 
{
    // Private member the unit test `utFooFixture::utMethod1` method needs to access
    PROCESS_INFORMATION m_fooProc; 

public:
    void LaunchProcess() { // Uses m_fooProc to run a windows app }
    void TerminateProcess() { // Uses m_fooProc to close a windows app }

#ifdef UNITTESTS
public: 
   FRIEND_TEST(utFooFixture , FooStartsAndClosesProcess); // VS Warns "VCR001: Function definition for 'FRIEND TEST' not found". 
#endif
};

utFoo.cpp

#include "gtest/gtest.h"
#include "Foo.h"

class utFooFixture : public testing::Test
{
public:
    void SetUp() {...}
    void TearDown() {}
    
    bool utMethod1(Foo &foo)
    {
        // Call Foo's public interface
        foo.LaunchProcess();

        DWORD status;
        GetExitCodeProcess(foo.m_fooProc.hProcess, &status); // "Error: Foo::m_fooProc is inaccessible"
        
        // Process launched successfully
        if (status == 0) {
            return true;
        } 

        return false;
    }
};

TEST_F(utFooFixture, FooStartsAndClosesProcess)
{
    Foo f1; 
    bool launchWasSuccessful = utMethod1(f1); 
    ASSERT_EQ(launchWasSuccessful , true);
}

FRIEND_TEST(utFooFixture, FooStartsAndClosesProcess) declares a class of the test case to be a friend. But you are trying to access Foo::m_fooProc from the class utFooFixture that should be a friend.

#ifdef UNITTESTS
- public: 
-    FRIEND_TEST(utFooFixture , FooStartsAndClosesProcess); // VS Warns "VCR001: Function definition for 'FRIEND TEST' not found". 
+    friend class utFooFixture; 
#endif

BTW public: to friend declarations is not necessary.