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Wifimanager when disconnecting does not save credentials

Good people, I am very new to this, I have a problem with wifimanager when turning off my wemos D1 and turning on again, the credentials are erased, the AP is reopened to enter everything back, I am using a code @primerIsNerdArt it works perfect, but When I add my code, the problem with the credentials begins, Mr. @PeteKnight was helping me but I think I was very confused with my explanations that were not precise at all, I apologize, I am new, my code and serial monitor thank you very much

#include <FS.h>    
//#define BLYNK_PRINT Serial
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
#include <DNSServer.h>
#include <ESP8266WebServer.h>
#include <WiFiManager.h> 
#include <ArduinoJson.h>    
//define your default values here, if there are different values in config.json, they are overwritten.
char mqtt_server[40];
char mqtt_port[6] = "8080";
char blynk_token[34] = "zUDZm-EtQq9arxeaE1IJZtAjFi_uCI3L";

//flag for saving data
bool shouldSaveConfig = false;

// Keep this flag not to re-sync on every reconnection
bool isFirstConnect = true;
// This function will run every time Blynk connection is established
BLYNK_CONNECTED() 
{
  if (isFirstConnect) 
  {
    // Request Blynk server to re-send latest values for all pins
    Blynk.syncAll();
    isFirstConnect = false;
  }
}
bool alarm_mode = false ;
bool verificador = false;
int led_placa = 2;
int sensor = 5;
int buzzer = 15;
int alarm_led = 4;
int alarm_led_off = 0;
//int boton = 12;
int indicador = 13;
int ledPin = 14;
int contconexion = 0;
int conteoReactivacion = 0;

BlynkTimer timer;
//callback notifying us of the need to save config
void saveConfigCallback () {
  Serial.println("Should save config");
  shouldSaveConfig = true;
  }
void myTimerEvent() {
 //Serial.println("Tiempo desactivada en seg: " + String(conteoReactivacion));
  if (alarm_mode == false) {
    conteoReactivacion++;
    if (conteoReactivacion >= 600) { //son 30 minutos es 1800 segundos dividido en 3 da 600 segundos por el delay que se le da a V0 de 3000 milisegundos para retrasar el pulso de disparo por 3 segundos
      Blynk.virtualWrite(V1, 1);
      digitalWrite(alarm_led, HIGH);
      digitalWrite(alarm_led_off, LOW);
      alarm_mode = true;
    }
  } else {
    conteoReactivacion = 0;
  }
  if (digitalRead(sensor) == 0) {
    Blynk.virtualWrite(V0, "NORMAL");
    //delay(7000);
  }
  if (digitalRead(sensor) == 1)

  {
    Blynk.virtualWrite(V0, "ALERTA");
    
    if (alarm_mode == true)
      //AUTOR ALEXIS MORA
    {
      Blynk.email("ale24cba@gmail.com", "Historial de Alarmas", "Alarma Disparo");
      Blynk.notify("EME-WIFI EMERGENCIA SAN LORENZO 546");
      digitalWrite(buzzer, HIGH);
      delay(500);
      digitalWrite(buzzer, LOW);
    }
  }
}
BLYNK_WRITE(V1) {
  Serial.println(param.asInt());
  switch (param.asInt()) {
    case 1: {
        alarm_mode = true;
        digitalWrite(alarm_led, HIGH);
        digitalWrite(alarm_led_off, LOW);
        break;
      }
    case 2: {
        alarm_mode = false;
        digitalWrite(buzzer, LOW);
        digitalWrite(alarm_led, LOW);
        digitalWrite(alarm_led_off, HIGH);
        break;
    }    
  }
}

void setup()
{
  pinMode(sensor, INPUT_PULLUP);
  pinMode(buzzer, OUTPUT);
  pinMode(alarm_led, OUTPUT);
  pinMode(alarm_led_off, OUTPUT);
  //pinMode(boton, INPUT);
  pinMode(indicador, OUTPUT);
  pinMode(led_placa, OUTPUT);
  
  // Debug console
  Serial.begin(115200);
  Serial.println();
 // Blynk.begin(auth, ssid, pass);
  // Setup a function to be called every second
  timer.setInterval(1000L, myTimerEvent);

  // put your setup code here, to run once:
  
  //clean FS, for testing
  //SPIFFS.format();

  //read configuration from FS json
  Serial.println("mounting FS...");

  if (SPIFFS.begin()) {
    Serial.println("mounted file system");
    if (SPIFFS.exists("/config.json")) {
      //file exists, reading and loading
      Serial.println("reading config file");
      File configFile = SPIFFS.open("/config.json", "r");
      if (configFile) {
        Serial.println("opened config file");
        size_t size = configFile.size();
        // Allocate a buffer to store contents of the file.
        std::unique_ptr<char[]> buf(new char[size]);

        configFile.readBytes(buf.get(), size);
        DynamicJsonBuffer jsonBuffer;
        JsonObject& json = jsonBuffer.parseObject(buf.get());
        json.printTo(Serial);
        if (json.success()) {
          Serial.println("\nparsed json");

          //strcpy(mqtt_server, json["mqtt_server"]);
         //strcpy(mqtt_port, json["mqtt_port"]);
          strcpy(blynk_token, json["blynk_token"]);

        } else {
          Serial.println("failed to load json config");
        }
        configFile.close();
      }
    }
  } else {
    Serial.println("failed to mount FS");
  }
  //end read



  // The extra parameters to be configured (can be either global or just in the setup)
  // After connecting, parameter.getValue() will get you the configured value
  // id/name placeholder/prompt default length
  //WiFiManagerParameter custom_mqtt_server("server", "mqtt server", mqtt_server, 40);
  //WiFiManagerParameter custom_mqtt_port("port", "mqtt port", mqtt_port, 6);
  WiFiManagerParameter custom_blynk_token("blynk", "blynk token", blynk_token, 34);

  //WiFiManager
  //Local intialization. Once its business is done, there is no need to keep it around
  WiFiManager wifiManager;

  //set config save notify callback
  wifiManager.setSaveConfigCallback(saveConfigCallback);

  //set static ip
  //wifiManager.setSTAStaticIPConfig(IPAddress(10,0,1,99), IPAddress(10,0,1,1), IPAddress(255,255,255,0));
  
  //add all your parameters here
  //wifiManager.addParameter(&custom_mqtt_server);
  //wifiManager.addParameter(&custom_mqtt_port);
  wifiManager.addParameter(&custom_blynk_token);

  //reset settings - for testing
  wifiManager.resetSettings();

  //set minimu quality of signal so it ignores AP's under that quality
  //defaults to 8%
  //wifiManager.setMinimumSignalQuality();
  
  //sets timeout until configuration portal gets turned off
  //useful to make it all retry or go to sleep
  //in seconds
  //wifiManager.setTimeout(120);

  //fetches ssid and pass and tries to connect
  //if it does not connect it starts an access point with the specified name
  //here  "AutoConnectAP"
  //and goes into a blocking loop awaiting configuration
  if (!wifiManager.autoConnect("NanoWifi", "12345678")) {
    Serial.println("failed to connect and hit timeout");
    delay(3000);
    //reset and try again, or maybe put it to deep sleep
    ESP.reset();
    delay(5000);
  }

  //if you get here you have connected to the WiFi
  Serial.println("connected...yeey :)");

  //read updated parameters
  //strcpy(mqtt_server, custom_mqtt_server.getValue());
  //strcpy(mqtt_port, custom_mqtt_port.getValue());
  strcpy(blynk_token, custom_blynk_token.getValue());

  //save the custom parameters to FS
  if (shouldSaveConfig) {
    Serial.println("saving config");
    DynamicJsonBuffer jsonBuffer;
    JsonObject& json = jsonBuffer.createObject();
    //json["mqtt_server"] = mqtt_server;
   // json["mqtt_port"] = mqtt_port;
    json["blynk_token"] = blynk_token;

    File configFile = SPIFFS.open("/config.json", "w");
    if (!configFile) {
      Serial.println("failed to open config file for writing");
    }

    json.printTo(Serial);
    json.printTo(configFile);
    configFile.close();
    //end save
  }

 while (WiFi.status() != WL_CONNECTED) {
       int mytimeout = 5;
       delay(500);
       Serial.print(".");
       if((millis() / 1000) > mytimeout ){ // try for less than 6 seconds to connect to WiFi router
         Serial.println(" ");
          break;
        }
   }

   if(WiFi.status() == WL_CONNECTED){  
    //if you get here you have connected to the WiFi
   Serial.println(" ");
   Serial.println("connected to WiFi!! yay :)");
   Serial.println("IP address: ");
   Serial.println(WiFi.localIP()); 
   //digitalWrite(indicador, HIGH);
 
 
  Blynk.config(blynk_token);
  bool result = Blynk.connect();

  if (result != true)
  {
  Serial.println("BLYNK Connection Fail");
  Serial.println(blynk_token);
 // wifiManager.resetSettings();  //borra usuario y contraseña al grabar
  ESP.reset();
  //delay (5000);
  }
  else
  {
  Serial.println("BLYNK Connected!! Yay again");
  }
 }
 else if (WiFi.status() != WL_CONNECTED){
  Serial.println("WiFi Connection Fail");
 } 

}

void loop()
{
  Blynk.run();
  timer.run(); // Initiates BlynkTimer
}
2:14:50.105 -> mounting FS...
22:14:50.231 -> mounted file system
22:14:50.231 -> reading config file
22:14:50.231 -> opened config file
22:14:50.231 -> {"blynk_token":"zUDZm-EtQq9arxeaE1IJZtAjFi_uCI3L"}
22:14:50.231 -> parsed json
22:14:50.231 -> *WM: Adding parameter
22:14:50.231 -> *WM: blynk
22:14:50.231 -> *WM: settings invalidated
22:14:50.231 -> *WM: THIS MAY CAUSE AP NOT TO START UP PROPERLY. YOU NEED TO COMMENT IT OUT AFTER ERASING THE DATA.
22:14:50.231 -> *WM: 
22:14:50.231 -> *WM: AutoConnect
22:14:50.335 -> *WM: Connecting as wifi client...
22:14:50.335 -> *WM: Status:
22:14:50.335 -> *WM: 0
22:14:50.335 -> *WM: No saved credentials
22:14:50.335 -> *WM: Connection result: 
22:14:50.335 -> *WM: 0
22:14:50.335 -> *WM: 
22:14:50.335 -> *WM: Configuring access point... 
22:14:50.335 -> *WM: NanoWifi
22:14:50.335 -> *WM: 12345678
22:14:50.725 -> *WM: AP IP address: 
22:14:50.725 -> *WM: 192.168.4.1
22:14:50.725 -> *WM: HTTP server started
22:15:26.096 -> *WM: Request redirected to captive portal
22:15:29.548 -> *WM: Request redirected to captive portal
22:15:29.782 -> *WM: Handle root
22:15:45.758 -> *WM: Handle root
22:15:52.350 -> *WM: Scan done
22:15:52.350 -> *WM: TORRES
22:15:52.350 -> *WM: -28
22:15:52.350 -> *WM: Fibertel WiFi398 2.4GHz
22:15:52.350 -> *WM: -74
22:15:52.350 -> *WM: SantiyNicole
22:15:52.350 -> *WM: -89
22:15:52.350 -> *WM: Fibertel WiFi176 2.4GHz_2.4GEXT
22:15:52.350 -> *WM: -90
22:15:52.350 -> *WM: Fibertel WiFi581 2.4GHz
22:15:52.350 -> *WM: -91
22:15:52.350 -> *WM: Fibertel WiFi696 2.4GHz
22:15:52.350 -> *WM: -93
22:15:52.350 -> *WM: sinconexion
22:15:52.350 -> *WM: -94
22:15:52.459 -> *WM: Sent config page
22:16:18.975 -> *WM: WiFi save
22:16:18.975 -> *WM: Parameter
22:16:18.975 -> *WM: blynk
22:16:18.975 -> *WM: zUDZm-EtQq9arxeaE1IJZtAjFi_uCI3L
22:16:18.975 -> *WM: Sent wifi save page
22:16:19.959 -> *WM: Connecting to new AP
22:16:19.959 -> *WM: Connecting as wifi client...
22:16:20.006 -> *WM: Status:
22:16:20.006 -> *WM: 0
22:16:20.053 -> *WM: [ERROR] WiFi.begin res:
22:16:20.053 -> *WM: 6
22:16:25.877 -> *WM: Connection result: 
22:16:25.877 -> *WM: 3
22:16:25.924 -> Should save config
22:16:25.924 -> connected...yeey :)
22:16:25.924 -> saving config
22:16:25.924 -> {"blynk_token":"zUDZm-EtQq9arxeaE1IJZtAjFi_uCI3L"} 
22:16:25.924 -> connected to WiFi!! yay :)
22:16:25.924 -> IP address: 
22:16:25.924 -> 192.168.100.103
22:16:26.440 -> BLYNK Connected!! Yay again
22:16:26.440 -> *WM: freeing allocated params!
22:16:26.674 -> 1

As I said in your other topic (which I’ve now closed), you should comment-out this line.

If this line is actually commented-out in the code that you uploaded to produce this serial output then you’re wasting everyone’s time by doing this.

Pete.

I’m very sorry pet to have wasted your time … you were right, comment on that part of the code and it worked, I seemed to have done that before, but surely I was confused … a thousand apologies Pet and THANK YOU