Android: I get null when calling findViewById() from layout inflated from a BroadcastReceiver's context

Question

I am trying to display a custom toast view in my app when the user receives a notification. The custom toast appears fine, but I can't inflate its content and then update it as I wish. Here is my code:

Watcher class receiving the notification

class Watcher : ParsePushBroadcastReceiver() {
    override fun onPushReceive(context: Context, intent: Intent) {
        NotificationToast.show(context, "title text")
    }
}

NotificationToast.kt

class NotificationToast {
    companion object {
        fun show(context: Context, title: String) {
            val inflater = context.getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater
            val layout = inflater.inflate(R.layout.notification_toast, null)
            // This line below always returns null
            layout.findViewById<AppCompatTextView>(R.id.notification_toast_title_text_view).text = title
            val toast = Toast(context)
            toast.duration = Toast.LENGTH_SHORT
            toast.setGravity(Gravity.TOP, 0, 0)
            toast.view = layout
            toast.show()
        }
    }
}

notification_toast.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/notification_toast"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginHorizontal="24dp"
    android:layout_marginTop="24dp" >

    <androidx.appcompat.widget.AppCompatTextView
        android:id="@+id/notification_toast_title_text_view"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_margin="16dp"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

For some reason, in NotificationToast, the line with the findViewById() trying to access the notification_toast_title_text_view textview is always null. What is the reason?

Thank you for your help