<p> The <code>CreateAdditionalAssignmentsForHIT</code> operation increases the maximum number of assignments of an existing HIT. </p> <p> To extend the maximum number of assignments, specify the number of additional assignments.</p> <note> <ul> <li> <p>HITs created with fewer than 10 assignments cannot be extended to have 10 or more assignments. Attempting to add assignments in a way that brings the total number of assignments for a HIT from fewer than 10 assignments to 10 or more assignments will result in an <code>AWS.MechanicalTurk.InvalidMaximumAssignmentsIncrease</code> exception.</p> </li> <li> <p>HITs that were created before July 22, 2015 cannot be extended. Attempting to extend HITs that were created before July 22, 2015 will result in an <code>AWS.MechanicalTurk.HITTooOldForExtension</code> exception. </p> </li> </ul> </note>

{
  "success": true,
  "data": {
    "id": "abc123",
    "created_at": "2025-01-01T00:00:00Z"
  }
}

{
  "success": false,
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Invalid request parameters"
  }
}

<p> The <code>CreateAdditionalAssignmentsForHIT</code> operation increases the maximum number of assignments of an existing HIT. </p> <p> To extend the maximum number of assignments, specify the number of additional assignments.</p> <note> <ul> <li> <p>HITs created with fewer than 10 assignments cannot be extended to have 10 or more assignments. Attempting to add assignments in a way that brings the total number of assignments for a HIT from fewer than 10 assignments to 10 or more assignments will result in an <code>AWS.MechanicalTurk.InvalidMaximumAssignmentsIncrease</code> exception.</p> </li> <li> <p>HITs that were created before July 22, 2015 cannot be extended. Attempting to extend HITs that were created before July 22, 2015 will result in an <code>AWS.MechanicalTurk.HITTooOldForExtension</code> exception. </p> </li> </ul> </note>

{
  "success": true,
  "data": {
    "id": "abc123",
    "created_at": "2025-01-01T00:00:00Z"
  }
}

{
  "success": false,
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Invalid request parameters"
  }
}