Sending Message to Azure Service Bus works locally, but not from service deployed on AWS

Question

The following code works to send the message to an Azure Service Bus Queue when I run my service locally. The service is written with JAVA and with the Spring Boot Framework. The service is deployed on AWS, but needs to access the queue on Azure.

      // create a Service Bus Sender client for the queue
      ServiceBusSenderClient senderClient = new ServiceBusClientBuilder()
          .connectionString("myPrimaryConnectionStringForSending")
          // .transportType(AmqpTransportType.AMQP_WEB_SOCKETS)
          .sender()
          .queueName("myQueueName")
          .buildClient();
      // send one message to the queue
      senderClient.sendMessage(new ServiceBusMessage("Hello World!"));

This is the error message i get from the deployed service:

Caused by: com.azure.core.amqp.exception.AmqpException: Connection refused, errorContext[NAMESPACE: my-env-services-servicebus-namespace.servicebus.windows.net. ERROR CONTEXT: N/A]

When I try to send it with the .transportType(AmqpTransportType.AMQP_WEB_SOCKETS) line then I receive following error:

c.a.c.a.i.ReactorConnection              : onConnectionError connectionId[MF_074e33_164373...], hostName[proxy.private.emea.vwapps.io], message[Starting new reactor], error[protocol = my-env-services-servicebus-namespace.servicebus.windows.net host = null, TrackingId: d0b2ba5d-f5d9-4104-b5fa-..., at: 2022-02-01T17:29:51.299629Z[Etc/UTC], errorContext[NAMESPACE: my-env-services-servicebus-namespace.servicebus.windows.net. ERROR CONTEXT: N/A]]