curl -i -X PUT "https://api.box.com/2.0/storage_policy_assignments/932483" \
     -H "authorization: Bearer <ACCESS_TOKEN>" \
     -H "content-type: application/json" \
     -d '{
       "storage_policy": {
         "type": "storage_policy",
         "id": "1434325"
       }
     }'

client.storage_policy_assignments.update_storage_policy_assignment_by_id(
    storage_policy_assignment.id,
    UpdateStoragePolicyAssignmentByIdStoragePolicy(id=storage_policy_2.id),
)

await client.storagePolicyAssignments.updateStoragePolicyAssignmentById(
  storagePolicyAssignment.id,
  {
    storagePolicy:
      new UpdateStoragePolicyAssignmentByIdRequestBodyStoragePolicyField({
        id: storagePolicy2.id,
      }),
  } satisfies UpdateStoragePolicyAssignmentByIdRequestBody,
);

try await client.storagePolicyAssignments.updateStoragePolicyAssignmentById(storagePolicyAssignmentId: storagePolicyAssignment.id, requestBody: UpdateStoragePolicyAssignmentByIdRequestBody(storagePolicy: UpdateStoragePolicyAssignmentByIdRequestBodyStoragePolicyField(id: storagePolicy2.id)))

client.getStoragePolicyAssignments().updateStoragePolicyAssignmentById(storagePolicyAssignment.getId(), new UpdateStoragePolicyAssignmentByIdRequestBody(new UpdateStoragePolicyAssignmentByIdRequestBodyStoragePolicyField(storagePolicy2.getId())))

await client.StoragePolicyAssignments.UpdateStoragePolicyAssignmentByIdAsync(storagePolicyAssignmentId: storagePolicyAssignment.Id, requestBody: new UpdateStoragePolicyAssignmentByIdRequestBody(storagePolicy: new UpdateStoragePolicyAssignmentByIdRequestBodyStoragePolicyField(id: storagePolicy2.Id)));

{
  "id": "ZW50ZXJwcmlzZV8xMjM0NTY3ODkw",
  "type": "storage_policy_assignment",
  "storage_policy": {
    "id": "11446498",
    "type": "storage_policy"
  },
  "assigned_to": {
    "id": "11446498",
    "type": "file"
  }
}

{
  "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"
}