Por que minha segunda iteração sobre as chaves de um JSONObject não está em execução?

Eu tenho um JSONObjectque estou usando para criar uma tabela. Porém, quando uso as teclas uma segunda vez para criar cada uma das células, nada acontece. Incluí instruções de log para testar isso. Nenhum keys singular é impresso. Me chame de perplexo.

class MovieFragment : Fragment(), FinraDataInterface {

    private lateinit var binding: MovieFragmentBinding

    val finraDataInterface: FinraDataInterface = this

    override fun drawTable(jsonArrayData: JSONArray) {
//         ------ Draw the table -----
//         Draw the keys first
        val headerRow = TableRow(requireActivity())
        Log.d("jsonArray", jsonArrayData[0].toString())
        val firstRecord = jsonArrayData[0] as JSONObject
        val keys = firstRecord.keys()

        for (key in keys) {
            val textView = TextView(requireActivity())
            textView.text = key
            headerRow.addView(textView)
        }
        binding.table.addView(headerRow)

        // Draw the data second
        for (i in 0 until jsonArrayData.length()) {
            val record = jsonArrayData[i] as JSONObject
            Log.d("Record", record.toString())
            val tableRow = TableRow(requireActivity())
            Log.d("Table Row", "Table Row created")
            Log.d("Keys", listOf(keys).toString())

            // Error is right here.
            for (key in keys) {
                Log.d("key", key)
                val textView = TextView(requireActivity())
                val cellText = record[key] as String
                textView.text = cellText
                tableRow.addView(textView)
            }
            binding.table.addView(tableRow)
        }
    }

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View {
        binding = MovieFragmentBinding.inflate(layoutInflater)
        return binding.root
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)

        finraGetBondInfo("AMC")
    }




    private fun finraGetBondInfo(companyName: String) {
        val url = "https://www.finra.org/finra-data/fixed-income/corp-and-agency"

        val queue = Volley.newRequestQueue(requireActivity())
        var cfruid = ""

        val stringRequest = object: StringRequest(Request.Method.GET, url,
            { response ->
                Log.d("A", "Response is: " + response.substring(0,500))
            },
            { error ->
                Log.e("Error", error.toString())
            })
        {
            override fun  parseNetworkResponse(response : NetworkResponse) : Response<String> {
                // since we don't know which of the two underlying network vehicles
                // will Volley use, we have to handle and store session cookies manually
                Log.i("response", response.headers.toString());
                val cookies = HttpCookie.parse(response.headers?.get("Set-Cookie"))
                Log.d("Cookies:", cookies[0].toString())
                val indexOfEqualSign = cookies[0].toString().indexOf('=')
                cfruid = cookies[0].toString().substring(indexOfEqualSign + 1)
                Log.d("Cfruid:", cfruid)


                return super.parseNetworkResponse(response)
            }
        }

        queue.add(stringRequest)

        // Create our JSON Object for the finra call
        val json = JSONObject()
        val fieldsArray = JSONArray()
        fieldsArray.put("issueSymbolIdentifier")
        fieldsArray.put("issuerName")
        fieldsArray.put("isCallable")
        fieldsArray.put("productSubTypeCode")
        fieldsArray.put("couponRate")
        fieldsArray.put("maturityDate")
        fieldsArray.put("industryGroup")
        fieldsArray.put("moodysRating")
        fieldsArray.put("standardAndPoorsRating")
        fieldsArray.put("lastSalePrice")
        fieldsArray.put("lastSaleYield")
        json.put("fields", fieldsArray)

        json.put("dateRangeFilters", JSONArray())
        json.put("domainFilters", JSONArray())
        json.put("compareFilters", JSONArray())

        val multiJson = JSONObject()
        multiJson.put("fuzzy", false)
        multiJson.put("searchValue", companyName)
        multiJson.put("synonym", true)
        val subfieldsJson = JSONObject()
        subfieldsJson.put("name", "issuerName")
        subfieldsJson.put("boost", 1)
        val fieldsArray2 = JSONArray()
        fieldsArray2.put(subfieldsJson)
        multiJson.put("fields", fieldsArray2)
        val multiArray = JSONArray()
        multiArray.put(multiJson)

        json.put("multiFieldMatchFilters", multiArray)
        json.put("orFilters", JSONArray())
        json.put("aggregationFilter", JSONObject.NULL)
        val sortFieldsArray = JSONArray()
        sortFieldsArray.put("+issuerName")
        json.put("sortFields", sortFieldsArray)
        json.put("limit", 50)
        json.put("offset", 0)
        json.put("delimiter", JSONObject.NULL)
        json.put("quoteValues", false)

        Log.d("JSON", json.toString())


        val url2 = "https://services-dynarep.ddwa.finra.org/public/reporting/v2/data/group/FixedIncomeMarket/name/CorporateAndAgencySecurities"
        val request2 = object: JsonObjectRequest(Request.Method.POST, url2, json,
            { response ->
                // TODO replace this with our calls to make tab2 display bond data
                val returnBody =  response["returnBody"] as JSONObject
                var stringData = returnBody["data"] as String
                stringData = stringData.replace("\\n", "").replace("\\", "")
                val jsonArrayData = JSONArray(stringData)

                finraDataInterface.drawTable(jsonArrayData)
            },
            { error ->
                Log.e("Error", error.toString())
            })
        {
            override fun getHeaders(): MutableMap<String, String> {
                val headers = HashMap<String, String>()
                headers["Authority"] = "services-dynarep.ddwa.finra.org"
                headers["Accept"] = "application/json, text/plain, */*"
                headers["Cookie"] = "XSRF-TOKEN=$cfruid;"
                headers["Origin"] = "https://www.finra.org"
                headers["Referer"] = "https://www.finra.org/"
                headers["X-XSRF-token"] = cfruid
                headers["user-agent"] =  "python-requests/2.31.0"
                Log.d("headers:", headers.toString())
                return headers
            }

            override fun getBodyContentType(): String {
                return "application/json"
            }
        }
        queue.add(request2)

    }

}

O que me deixou particularmente confuso é que o primeiro loop for de uso das teclas para criar a linha do cabeçalho funciona bem. Tentei transmitir coisas para tipos diferentes para ver se era algum erro de tipo. No entanto, é apenas o segundo loop for que não está em execução. Não recebo nenhuma mensagem de erro. o que estou perdendo? Obrigado.