Alarm not working on some android version or device like oppo when app close mostly on lollipop

Question

my alarm manager not working on lollipop version when app close while it's working on other Android version marshmallow, Nougat, perfectly

alarmManager = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
        Intent intent = new Intent(context, AlarmReciver.class);
        intent.putExtra("msg", msgstring);
        intent.putExtra("num", recipstring);
        intent.putExtra("recipname", name);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(context, number, intent, PendingIntent.FLAG_UPDATE_CURRENT);
        alarmManager.set(AlarmManager.RTC_WAKEUP, targetCal.getTimeInMillis(), pendingIntent);``

here is my alarm receiver:

public class AlarmReciver extends WakefulBroadcastReceiver {
@Override  public void onReceive(Context context, Intent intent) {
  Notification.Builder builder= new Notification.Builder(context);
        builder.setAutoCancel(true)
                .setDefaults(Notification.DEFAULT_ALL)
                .setWhen(System.currentTimeMillis()).setColor(Color.WHITE)
                .setSmallIcon(R.mipmap.ic_launcher).setPriority(Notification.PRIORITY_HIGH)
                .setDefaults(Notification.DEFAULT_LIGHTS|Notification.DEFAULT_SOUND)
                .setContentTitle("test")
                .setContentText(message);
        NotificationManager notificationManager=(NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);
        notificationManager.notify(1, builder.build());
        dbhelper.insertdilvery(message, name);
}
    }

Manifest file:

   <receiver android:name="com.simulatorgames3d.EventsNotifications.alarmreceiver.AlarmReciver"
            android:process=":remote"
            android:enabled="true"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </receiver>

permissions

<uses-permission android:name="android.permission.VIBRATE" />
    <uses-permission android:name="android.permission.WAKE_LOCK" />
    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"></uses-permission>

herr is logcat pic when app not close

locat when app close and alrm not fire