AMQP implementation - acknowledge not working

I am testing the AMQP 1.0 with Azure service Bus queue.

When I call message.acknowledge() and I restart the java listener, then I receive again the message from the queue.

This is my code:

 sendSession = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        sender = sendSession.createProducer(queue);

        if (runReceiver) {
            // Create receiver-side Session, MessageConsumer,and MessageListener
            receiveSession = connection.createSession(false, Session.CLIENT_ACKNOWLEDGE);
            
            receiver = receiveSession.createConsumer(queue);
            
            receiver.setMessageListener(this);
            connection.start();

    public void onMessage(Message message) {
        try {
 
            //System.out.println("Received message with JMSMessageID = " + message.getJMSMessageID());
        	String txt = message.getStringProperty("data");
            Gson gson = new Gson();
            Email email = gson.fromJson(txt, Email.class);   
            System.out.println("Messaggio ricevuto: " + email.From);
            System.out.println("Messaggio ricevuto: " + email.Body);
            message.acknowledge();

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

Any suggestion?

Giuseppe