Android notification buttons do not appear on mobile device

Question

I always interacted with my Android application by emulator, but recently I started to test everything I did with my phone.

I created some notifications with buttons, and in the emulator they appear as expected and do what they are supposed to do, but on my phone, only the notification appears the buttons do not exist.

Can anyone tell me why this is happening?

I leave here part of the code where I create the buttons in the notification.

Intent intentCriado = new Intent(context, CriadoService.class);
intentCriado.putExtra("id", id);
intentCriado.putExtra("idTrabalho", idTrab);

PendingIntent resultPendingTrablalhoCriado =
        PendingIntent.getService(context,
                0,
                intentCriado,
                PendingIntent.FLAG_CANCEL_CURRENT
        );

Intent intentCancelado = new Intent(context, CanceladoService.class);
intentCancelado.putExtra("id", String.valueOf(id));
intentCancelado.putExtra("idTrabalho", String.valueOf(idTrab));

PendingIntent resultPendingTrablalhoCancelado =
        PendingIntent.getService(context,
                0,
                intentCancelado,
                PendingIntent.FLAG_CANCEL_CURRENT
        );

NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(context)
        .setContentTitle("TRABALHOS:")
        .setContentText(mensagem)
        .setContentIntent(resultPendingTrablalhoCriado)
        .setAutoCancel(true);
mBuilder.setSmallIcon(R.drawable.icon);
mBuilder.addAction(R.drawable.icon, "Sim", resultPendingTrablalhoCriado);
mBuilder.addAction(R.drawable.icon, "Não", resultPendingTrablalhoCancelado);
mBuilder.setPriority(Notification.PRIORITY_MAX);