Error using java sample: Login credentials denied

I created an account and tried to run the sample firehose_examples/SSL_Client_gson.java at master · flightaware/firehose_examples · GitHub

Using the account user/password I have this error:

 Running Client
msg: Error: Login credentials denied: gzk

What is the problem?

The Firehose service is a premium service that must be enrolled separately by contacting our sales team. A standard FlightXML account is not sufficient for accessing Firehose.