Cannot enable Network Extensions - Objective-C

So I wanted to get my hands dirty with objective-c so I decided to create a project to list all outbound traffic, after digging a little I found that I could use the Network Extension API. I created a simple command line project with xcode and tried to load this extension but for some reason I can't get it to work.

I don't have a developer license yet and I'm not sure if it has anything to do with the problem I'm facing.

This is just some test code so there are 2 free functions, one for loading the system extension and another for checking its status:

// activates the extension?
BOOL toggleNetworkExtension(NSUInteger action)
{
	BOOL toggled = NO;
	__block BOOL wasError = NO;
	
	__block NEFilterProviderConfiguration* config = nil;
	
	dispatch_semaphore_t semaphore = 0;
	
	semaphore = dispatch_semaphore_create(0);
	
	NSLog(@"toggling the network extension");
	
	[NEFilterManager.sharedManager loadFromPreferencesWithCompletionHandler:^(NSError * _Nullable error) {		
		if(nil != error)
		{
			wasError = YES;
			
			NSLog(@"loadFromPreferencesWithCompletionHandler error");
		}
	
		dispatch_semaphore_signal(semaphore);
		
	}];
	
	NSLog(@"waiting for the network extension configuration...");
	
	if(YES == wasError) goto fail;
   
	NSLog(@"loaded current filter configuration for the network extension");

	if(1 == action)
	{
		NSLog(@"activating network extension...")	;
	
		if(nil == NEFilterManager.sharedManager.providerConfiguration)
		{
			
			config = [[NEFilterProviderConfiguration alloc] init];
			
			config.filterPackets = NO;
			config.filterSockets = YES;
			
			NEFilterManager.sharedManager.providerConfiguration = config;
		}
		
		NEFilterManager.sharedManager.enabled = YES;
	}
	
	else
	{
		NSLog(@"deactivating the network extension...");
		NEFilterManager.sharedManager.enabled = NO;
	}
	
	{ [NEFilterManager.sharedManager saveToPreferencesWithCompletionHandler:^(NSError * _Nullable error) {
		
		if(nil != error)
		{
			wasError = YES;
		
			NSLog(@"saveToPreferencesWithCompletionHandler error!");
		}
		
		dispatch_semaphore_signal(semaphore);
			
	}]; }
	
	NSLog(@"waiting for network extension configuration to save...");

	if(YES == wasError) goto fail;
	
	NSLog(@"saved current filter configuration for the network extension");
		
	toggled = YES;
		
fail:
	
	return toggled;
}

Then there's this function to check if the extension is enabled which for some reason always returns false.

BOOL isNetworkExtensionEnabled(void)
{

	__block BOOL isEnabled = NO;

	dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);

	[NEFilterManager.sharedManager loadFromPreferencesWithCompletionHandler:^(NSError * _Nullable error) {
		if (error != nil) 
		{
			NSLog(@"Error with loadFromPreferencesWithCompletionHandler");
			
		}
		else
		{
			isEnabled = NEFilterManager.sharedManager.enabled;
		}

		dispatch_semaphore_signal(semaphore);
	}];

	return isEnabled;
}

Is something wrong is this code or is this related to entitlements or the developer license?

As a side note I have already disabled SIP not sure if it matters in this case.

Thanks in advance.