Android-alarmManager.setRepeating不重复

我目前正试图让我的闹钟管理器在我的小部件中每分钟调用一个函数，但它只调用一次。有人看到这个代码有什么问题吗

    override fun onUpdate(
    context: Context,
    appWidgetManager: AppWidgetManager,
    appWidgetIds: IntArray
) {

    val alarmManager: AlarmManager = context.getSystemService(Context.ALARM_SERVICE) as AlarmManager
    val intent = Intent(context, UpdateService::class.java)

    if (service == null) {
        val random = (0..1000000).shuffled().first()
        service = PendingIntent.getBroadcast(context, random, intent, PendingIntent.FLAG_CANCEL_CURRENT)
    }

    alarmManager.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, SystemClock.elapsedRealtime(), 60000, service)

}