Cant connect to MQTT ( Dashboard is offline !)

Hi ,
We defined a project in Cayenne some time ago and it worked fine until a week ago but now we can not connect to mqtt servers and the dashboard tells us that you are offline.
Our university project is a smart greenhouse and we will provide the related code below.
Is there a problem with Cayenne’s servers ?!
Please guide us soon.
Thanks

#define CAYENNE_DEBUG
#define CAYENNE_PRINT Serial
#include <CayenneMQTTESP32.h>
#include <DHT.h>
#include <DHT_U.h>

#define DHTPIN 26
#define DHTTYPE DHT11
#define VIRTUAL_CHANNEL_5 5
DHT_Unified dht(DHTPIN, DHTTYPE);
int maxx=4095 ;
int maxk=4095 ;

int w;

#define relay 12
#define led1 27
#define led2 22
#define led3 23
unsigned long lastMillis = 0;

#define Humsensor 5

char ssid = “";
char wifiPassword[] = "
*”;

char username = “";
char password[] = "
”;
char clientID = “***”;

void setup() {

Serial.begin(9600);
Cayenne.begin(username, password, clientID, ssid, wifiPassword);

pinMode(12 , OUTPUT);  //relay
pinMode(led1 , OUTPUT);  //led1
pinMode(led2 , OUTPUT);  //led2
pinMode(led3 , OUTPUT);  //led3

delay(10);
digitalWrite(relay , LOW);
digitalWrite(led1 , LOW);
digitalWrite(led2 , LOW);
digitalWrite(led3 , LOW);

}

void loop() {

Cayenne.loop();

int x = analogRead(Humsensor);
if (x<maxx)
maxx = x ;
int y = map(x, 4095, maxx , 0, 100);
Cayenne.virtualWrite(1,y, “soil_moist” , “p” ); //channel 1

sensors_event_t event;
dht.temperature().getEvent(&event);
Cayenne.celsiusWrite(2, event.temperature); //channel 2,3
dht.humidity().getEvent(&event);
Cayenne.virtualWrite(3, event.relative_humidity, “rel_hum”, “p”);

int sensorValue = analogRead(34);
int w = map(sensorValue, 1, 4095 , 0,100);
Cayenne.virtualWrite(8, w, "lum" , "p" );

delay(200);
}

CAYENNE_IN(4) //pump
{
int currentValuep = getValue.asInt();
if (currentValuep == 1)
{
//do whatever you want when you turn on the button on cayenne dashboard
digitalWrite(relay, HIGH);
}
else
{
//do whatever you want when you turn off the button on cayenne dashboard
digitalWrite(relay, LOW);
}
}

CAYENNE_IN(5) //led1
{
int currentValue = getValue.asInt();
if (currentValue == 1)
{
//do whatever you want when you turn on the button on cayenne dashboard
digitalWrite(led1, HIGH);
}
else
{
//do whatever you want when you turn off the button on cayenne dashboard
digitalWrite(led1, LOW);
}
}

CAYENNE_IN(6) //led2
{
int currentValue2 = getValue.asInt();
if (currentValue2 == 1)
{
//do whatever you want when you turn on the button on cayenne dashboard
digitalWrite(led2, HIGH);
}
else
{
//do whatever you want when you turn off the button on cayenne dashboard
digitalWrite(led2, LOW);
}
}

CAYENNE_IN(7) //led3
{
int currentValue3 = getValue.asInt();
if (currentValue3 == 1)
{
//do whatever you want when you turn on the button on cayenne dashboard
digitalWrite(led3, HIGH);
}
else
{
//do whatever you want when you turn off the button on cayenne dashboard
digitalWrite(led3, LOW);
}
}

same here

What to do ?

I just checked and my device is connected. Is it showing online now?

What does the serial monitor output?

MQTT connect failed, error -1

No, My dashboard is offline.!!!