Notifications only work on certain versions of android

My app uses a receiver to send the user notifications after a certain amount of time. The receiver works great as it runs a few functions, the notification however doesn't work so smoothly.

On the emulator (API29 and Android 10) it sends them correctly however when I install it on real devices it either doesn't work at all or works perfectly fine.

My phone had the notifications perfectly until when I updated it to android 12, from then on no notifications are fired. I also tested it on an older device (Android 7) and again it doesn't work.

I read into it and don't really understand how the channels work, so I think the issue might be there however I find it weird how it would then still work on some devices/emulators.

Here is my code:

class MyReceiver: BroadcastReceiver() {

    @RequiresApi(Build.VERSION_CODES.O)
    override fun onReceive(context: Context, intent: Intent) {

        val notificationChannel =
          NotificationChannel("My Channel", "New Quote", 
          NotificationManager.IMPORTANCE_DEFAULT).apply {
            description = "Alerts when A new daily quote is set!"
          }

        val titles = arrayOf(
          "Become inspired!",
          "Check out this quote!",
          "A new quote appeared!",
          "Daily quote available!"
        )
        val title = titles.random()

        val i = Intent(context, Qinperation::class.java)

        val builder = NotificationCompat.Builder(context, "My Channel")
          .setSmallIcon(R.drawable.ic_stat_name)
          .setContentTitle(title)
          .setContentText("A new daily quote is available for viewing")
          .setContentIntent(
            PendingIntent.getActivity(
              context,
              0,
              i,
              PendingIntent.FLAG_UPDATE_CURRENT
            )
          );

        with(NotificationManagerCompat.from(context)) {
          createNotificationChannel(notificationChannel)
          notify(1, builder.build())
        }
    }
}

All help is appreciated :)

This was my bad. Turns out that on certain devices (like the one I was testing on), Doesn't support the pending intent I was using to fire the notification. If people have a similar issue, try changing Pending Intents to - PendingIntent.FLAG_IMMUTABLE as this works on more devices, Especially newer ones!