curl -i -X PUT "https://api.box.com/2.0/files/12345/metadata/enterprise/securityClassification-6VMVochwUWo" \
     -H "authorization: Bearer <ACCESS_TOKEN>" \
     -H "content-type: application/json-patch+json" \
     -d '[{
       "op": "replace",
       "path": "/Box__Security__Classification__Key",
       "value": "Internal"
     }]'

client.file_classifications.update_classification_on_file(
    file.id, [UpdateClassificationOnFileRequestBody(value=second_classification.key)]
)

await client.fileClassifications.updateClassificationOnFile(file.id, [
  new UpdateClassificationOnFileRequestBody({
    value: secondClassification.key,
  }),
]);

try await client.fileClassifications.updateClassificationOnFile(fileId: file.id, requestBody: [UpdateClassificationOnFileRequestBody(value: secondClassification.key)])

client.getFileClassifications().updateClassificationOnFile(file.getId(), Arrays.asList(new UpdateClassificationOnFileRequestBody(secondClassification.getKey())))

await client.FileClassifications.UpdateClassificationOnFileAsync(fileId: file.Id, requestBody: Array.AsReadOnly(new [] {new UpdateClassificationOnFileRequestBody(value: secondClassification.Key)}));

{
  "Box__Security__Classification__Key": "Sensitive",
  "$parent": "folder_59449484661,",
  "$template": "securityClassification-6VMVochwUWo",
  "$scope": "enterprise_27335",
  "$version": 1,
  "$type": "securityClassification-6VMVochwUWo-fd31537a-0f95-4d86-9f2b-5974a29978f8",
  "$typeVersion": 5,
  "$canEdit": true
}

{
  "type": "error",
  "status": 400,
  "code": "item_name_invalid",
  "message": "Method Not Allowed",
  "context_info": {
    "message": "Something went wrong"
  },
  "help_url": "https://developer.box.com/guides/api-calls/permissions-and-errors/common-errors/",
  "request_id": "abcdef123456"
}

{
  "type": "error",
  "status": 400,
  "code": "item_name_invalid",
  "message": "Method Not Allowed",
  "context_info": {
    "message": "Something went wrong"
  },
  "help_url": "https://developer.box.com/guides/api-calls/permissions-and-errors/common-errors/",
  "request_id": "abcdef123456"
}

{
  "type": "error",
  "status": 400,
  "code": "item_name_invalid",
  "message": "Method Not Allowed",
  "context_info": {
    "message": "Something went wrong"
  },
  "help_url": "https://developer.box.com/guides/api-calls/permissions-and-errors/common-errors/",
  "request_id": "abcdef123456"
}