I am having trouble submitting a RubricAssessment via the Canvas API. I am following this Create a single rubric assessment API doc. Below is what I have attempted along with example data and error message. What is wrong with my RubricAssessment POST?

 GET /api/v1/courses/1022/rubrics/500?include[]=associations

Response(contains the RurbricAssociation id and Criterion ids needed to create RubricAssessment)

{
  id: 500,
  context_id: 1022,
  context_type: 'Course',
  data: [
    {
      description: 'Student can clearly communicate...',
      points: 3,
      id: '_340',
      criterion_use_range: false,
      long_description: '<p> Desc...</p>',
      learning_outcome_id: 6379,
      mastery_points: 2,
      ignore_for_scoring: false,
      ratings: [Array]
    },
    {
      description: 'Student can clearly articulate their collaboration',
      points: 3,
      id: '_2874',
      criterion_use_range: false,
      long_description: '<p><b>1</b>: Long desc...</p>',
      learning_outcome_id: 6378,
      mastery_points: 2,
      ignore_for_scoring: false,
      ratings: [Array]
    },
    {
      description: 'Student publishes a clearly articulated...',
      points: 3,
      id: '_2311',
      criterion_use_range: false,
      long_description: "<p>Long desc...</p>\n",
      learning_outcome_id: 6380,
      mastery_points: 2,
      ignore_for_scoring: false,
      ratings: [Array]
    }
  ],
  points_possible: 9,
  title: 'Sprint Challenge 2 Rubric',
  reusable: false,
  public: false,
  read_only: false,
  free_form_criterion_comments: true,
  hide_score_total: null,
  associations: [
    {
      id: 750,
      rubric_id: 500,
      association_id: 18647,
      association_type: 'Assignment',
      use_for_grading: true,
      summary_data: null,
      purpose: 'grading',
      hide_score_total: false,
      hide_points: false,
      hide_outcome_results: false
    }
  ]
}

POST to : /api/v1/courses/1022/rubric_associations/750/rubric_assessments (1022 is a course, 750 is a rubric_association)

Request Payload:

{
  "rubric_assessment": {
    "course_id": 1022,
    "rubric_association_id": 750,
    "rubric_assessment": {
      "user_id": 1934,
      "assessment_type": "grading",
      "criterion_340": { "points": 2, "comments": "Test comment 1" },
      "criterion_2874": { "points": 2, "comments": "Test comment 2" },
      "criterion_2311": { "points": 2, "comments": "Test comment 3" }
    }
  }
}

Response:

{"errors":[{"message":"The specified resource does not exist."}]}