How to get value of advanced power settings for sleep after

I have an application the needs to get the sleep after setting value, I have codes now that gets the Hibernate value setting from power plan and now my challenge is to get the setting values from Sleep after.

What if I want to get the SLEEP AFTER? I try to use the "29f6c1db-86da-48c5-9fdb-f2b67b1f44da" GUID as PowerSettingsGuid to get the Sleep After value but it doesn't work and it always get the Hibernate values.

Subgroup GUID: 238c9fa8-0aad-41ed-83f4-97be242c8f20  (Sleep)
GUID Alias: SUB_SLEEP
Power Setting GUID: 29f6c1db-86da-48c5-9fdb-f2b67b1f44da  (Sleep after)
  GUID Alias: STANDBYIDLE
  Minimum Possible Setting: 0x00000000
  Maximum Possible Setting: 0xffffffff
  Possible Settings increment: 0x00000001
  Possible Settings units: Seconds
Current AC Power Setting Index: 0x00000708
Current DC Power Setting Index: 0x00000384

Below are the codes I copied on the How to get the value of advanced power settings post

private static Guid GUID_SLEEP_SUBGROUP = new Guid("238c9fa8-0aad-41ed-83f4-97be242c8f20");
private static Guid GUID_HIBERNATEIDLE = new Guid("9d7815a6-7ee4-497e-8888-515a05f02364");
private static Guid GUID_STANDBYIDLE = new Guid("29f6c1db-86da-48c5-9fdb-f2b67b1f44da");

[DllImport("powrprof.dll")]
static extern uint PowerGetActiveScheme(IntPtr UserRootPowerKey, ref IntPtr ActivePolicyGuid);

[DllImport("powrprof.dll")]
static extern uint PowerReadACValue(IntPtr RootPowerKey,
        ref Guid SchemeGuid,
        ref Guid SubGroupOfPowerSettingGuid, 
        ref Guid PowerSettingGuid, 
        ref int Type,ref int Buffer, 
        ref uint BufferSize);

private void Get_SLEEP_AFTER_SETTINGS()
{
    var activePolicyGuidPTR = IntPtr.Zero;
    PowerGetActiveScheme(IntPtr.Zero, ref activePolicyGuidPTR);

    var activePolicyGuid = Marshal.PtrToStructure<Guid>(activePolicyGuidPTR);
    var type = 0;
    var value = 0;
    var valueSize = 4u;
    PowerReadACValue(IntPtr.Zero, ref activePolicyGuid, ref GUID_SLEEP_SUBGROUP, ref GUID_STANDBYIDLE, ref type, ref value, ref valueSize);

    var message = $"Sleep setting is {value} seconds.";
}