SQS Bad response code = 400, statusText=Bad Request with example

[cup-a-snot]

I tried the example for SQS and replaced the values with mine and I get the following error:

Unhandled Exception: Exception: Bad response code=400, statusText=Bad Request

This is my code:
`var credentials = Credentials(
accessKey: 'XXXXXXXXXXXXX',
secretKey: 'YYYYYYYYYYYYYYYYYY');

var httpClient = http.ConsoleClient();
var aws = new Aws(credentials: credentials, httpClient: httpClient);
var queue = aws.sqs
    .queue('https://sqs.us-east-1.amazonaws.com/123456789/nameOfMyQueue.fifo');
await queue.sendMessage('Hello from Dart client!');
httpClient.close();`

Any idea of what could be going on?

Cheers