Unity Local Notifications Inconsistency Issue?

I'm trying to implement Unity Local Notifications Package to work on iOS. I got it working on Android easy, but I cannot point to why it is not working on iOS. Here is my code:

     TimeSpan diff = DateTime.Parse("06/05/2022 08:30:00") - DateTime.Parse("06/05/2022 00:50:20");

     var timeTrigger = new iOSNotificationTimeIntervalTrigger()
     {
         TimeInterval = diff,
         Repeats = false
     };

     var notification = new iOSNotification()
     {
         Identifier = "_notification_01",
         Title = "Title",
         Body = "Scheduled at: " + DateTime.Now.ToShortDateString() + " triggered in 5 seconds",
         Subtitle = "This is a subtitle, something, something important...",
         ShowInForeground = true,
         ForegroundPresentationOption = (PresentationOption.Alert | PresentationOption.Sound),
         CategoryIdentifier = "category_a",
         ThreadIdentifier = "thread1",
         Trigger = timeTrigger,
     };

     iOSNotificationCenter.ScheduleNotification(notification);
 

The above does not work but if I change the time to direct timespan, it works: The below code works just fine:

     TimeSpan diff = new TimeSpan(0,15,0)

     var timeTrigger = new iOSNotificationTimeIntervalTrigger()
     {
         TimeInterval = diff,
         Repeats = false
     };

     var notification = new iOSNotification()
     {
         Identifier = "_notification_01",
         Title = "Title",
         Body = "Scheduled at: " + DateTime.Now.ToShortDateString() + " triggered in 5 seconds",
         Subtitle = "This is a subtitle, something, something important...",
         ShowInForeground = true,
         ForegroundPresentationOption = (PresentationOption.Alert | PresentationOption.Sound),
         CategoryIdentifier = "category_a",
         ThreadIdentifier = "thread1",
         Trigger = timeTrigger,
     };

     iOSNotificationCenter.ScheduleNotification(notification);