What value do I insert inside the body of my API request according to this API Specification?

I'm trying to make a data request call from a data exchange API based on the data provider's API specification.

My app is built using the Node.JS and NPM.

I'm subscribed to use the API and I've verified that all my identity credentials, policies and IAM keys that give me permission to access the API.

However when I test the request call in AWS CLI, I get the message '404: Asset not found'.

What could be the problem with my API request call?

Thanks!

My current request code looks like below:

aws dataexchange send-api-asset \
  --data-set-id xe4xxxxxxxxxx72b7edxxxx6 \
  --revision-id xx54cxxxxxxxx9d05d81xxxxxxxx \
  --asset-id xxxxxxbde1fa3d5xxxxe2bb5xx \
  --method POST \
  --path "/psdm/graphql/" \
  --query-string-parameters 'param1=value1,param2=value2' \
  --request-headers '{"Content-Type": "application/json"}' \
  --body '{"content": {
            "application/graphql": {
              "schema": {
                "$ref": "#/components/schemas/CatalogSearchRequest"
              },
              "value": "{ursa_udp_availablemetadatarecord(limit: 10 content: {catalogProperties: { vendor: { eq: \"ICEYE\" } } } ) { assignedId }}"
            }
          },
          "required": true
        }'

The Actual API Specification:

{
  "openapi": "3.0.1",
  "info": {
    "title": "image-services",
    "description": "API Gateway for integration of Platform Services into AWS Data Exchange",
    "version": "2022-03-03T20:04:18Z"
  },
  "servers": [
    {
      "url": ""
    }
  ],
  "paths": {
    "/psdm/graphql": {
      "post": {
        "requestBody": {
          "description": "GraphQL query for the Catalog in the form of:\n\n  `{\n    availablemetadatarecord(\n      QUERYPARAMS\n    ) { \n      FIELDLIST\n    } \n  }`\n",
          "content": {
            "application/graphql": {
              "schema": {
                "$ref": "#/components/schemas/CatalogSearchRequest"
              },
              "examples": {
                "Limit returned data": {
                  "description": "Limit the number of records in a response.\n\nIn your query, simply specify `limit: <int>` \n",
                  "value": "{\n  availablemetadatarecord(\n    limit: 10\n    content: { catalogProperties: { vendor: { eq: \"EYE\" } } }\n  ) {\n    assignedId\n  }\n}\n"
                }
              }
            }
          },
          "required": true
        },
        "responses": {
          "200": {
            "description": "200 response",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/CatalogSearchResponse"
                }
              }
            }
          }
        },
        "security": [
          {
            "sigv4": []
          }
        ]
      }
    }
  },
  "components": {
    "schemas": {
      "CatalogSearchRequest": {
        "title": "CatalogSearchRequest",
        "type": "object"
      },
      "CatalogSearchResponse": {
        "title": "Catalog Search Response",
        "required": [
          "data",
          "paginationInfo"
        ],
        "type": "object",
        "properties": {
          "paginationInfo": {
            "type": "object",
            "properties": {
              "recordsInPage": {
                "type": "integer"
              },
              "nextOffset": {
                "type": "integer"
              }
            }
          },
          "data": {
            "type": "object",
            "properties": {
              "availablemetadatarecord": {
                "type": "array",
                "description": "Records returned by query",
                "items": {
                  "type": "object"
                }
              }
            }
          }
        }
      }
    },
    "securitySchemes": {
      "sigv4": {
        "type": "apiKey",
        "name": "Authorization",
        "in": "header",
        "x-amazon-apigateway-authtype": "awsSigv4"
      }
    }
  }
}