'ios, swift: group local notifications together

I'm trying to group different local notifications together, but iOS 15.2 seems to ignore the threadIdentifier parameter and it stills display the notifications in separate rows:

let trigger = UNCalendarNotificationTrigger(dateMatching: dateComponents, repeats: true)
let notificationContent = UNMutableNotificationContent()
// ... more properties
notificationContent.threadIdentifier = "please-group-together" // not working

let request = UNNotificationRequest(identifier: UUID().uuidString, content: notificationContent, trigger: trigger)
UNUserNotificationCenter.current().add(request, withCompletionHandler: completion)

Am I missing something?



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