A sub-classed UnityAppController that allows a tvOS application to be manually suspended, to circumvent Unity issue #1134856. To use, place both files in a Plugin/tvOS folder in your Unity project and call UnityEngine.tvOS.Application.ExitToHomeScreen to suspend the application.

SuspendableAppController.cs

#if UNITY_TVOS
namespace UnityEngine
{
	namespace tvOS
	{
		public class Application
		{
			[System.Runtime.InteropServices.DllImport("__Internal")]
			extern static public void ExitToHomeScreen();
		}
	}
}
#endif

SuspendableAppController.mm

#import "UnityAppController.h"

@interface SuspendableAppController : UnityAppController

-(void) exitToHomeScreen;

@end

static SuspendableAppController* delegateObject;

@implementation SuspendableAppController

-(void) startUnity: (UIApplication*) application {
    [super startUnity: application];
    
    delegateObject = self;
}

-(void) exitToHomeScreen {
    UIApplication *app = [UIApplication sharedApplication];
    [app performSelector:@selector(suspend)];
}

extern "C" {
    void ExitToHomeScreen() {
        [delegateObject exitToHomeScreen];
    }
}

@end

IMPL_APP_CONTROLLER_SUBCLASS( SuspendableAppController )