curl --request GET \
  --url https://api.hubapi.com/crm/v3/imports/{importId}/errors \
  --header 'Authorization: Bearer <token>'

{
  "results": [
    {
      "createdAt": 123,
      "id": "<string>",
      "sourceData": {
        "additionalRowData": [
          "<string>"
        ],
        "containsEncryptedProperties": true,
        "fileId": 123,
        "lineNumber": 123,
        "rowData": [
          "<string>"
        ],
        "pageName": "<string>"
      },
      "errorMessage": "<string>",
      "extraContext": "<string>",
      "invalidPropertyValue": {
        "isEncrypted": true,
        "isLargeValue": true,
        "name": "<string>",
        "persistenceTimestamp": 123,
        "requestId": "<string>",
        "selectedByUser": true,
        "selectedByUserTimestamp": 123,
        "sourceId": "<string>",
        "sourceLabel": "<string>",
        "sourceMetadata": "<string>",
        "sourceUpstreamDeployable": "<string>",
        "sourceVid": [
          123
        ],
        "timestamp": 123,
        "unit": "<string>",
        "updatedByUserId": 123,
        "useTimestampAsPersistenceTimestamp": true,
        "value": "<string>"
      },
      "invalidValue": "<string>",
      "invalidValueToDisplay": "<string>",
      "knownColumnNumber": 123,
      "objectTypeId": "<string>"
    }
  ],
  "paging": {
    "next": {
      "after": "<string>",
      "link": "<string>"
    }
  }
}