Solved it by calling the completionHandler with an explicit Int value (i.e. completionHandler(1 << 4) for banner)

I'm seeing the same here. Xcode 15.3, Swift 5.0, Min SDK iOS 14.0 The accepted signature is: func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (Int) -> Void) { <#code#> } where instead of UNNotificationPresentationOptions there's Int

Same here... been struggling with this PiP in WebRTC for days now... horrible! in Android it took literally 3 lines of code