When requests to Step Function fail, Workflow Service performs exponential backoff retries to notify Step Function service. Number of retries = 3 The total duration of all attempts doesn't exceed 10 seconds, the processing must not exceed the message visibility timeout.

Script
{
  "StartAt": "Start",
  "States": {
    "Start": {
      "Type": "Task",
      "Resource": "arn:aws:lambda:us-east-1:662688594788:function:helloworld",
      "Retry": [
        {
          "ErrorEquals": [
            "States.ALL"
          ],
          "IntervalSeconds": 1,
          "MaxAttempts": 3,
          "BackoffRate": 2
        }
      ],
      "End": true
    }
  }
}