Unable to send and visualize data on my channel | ThingSpeak API | Forum

Hello,

I found simple example and tried to make it work. Based on what i see on serial monitor, code is working but the data are not visible on my channel.
If I go to https://api.thingspeak.com/update?api_key=XXXXXXXXXXXXXX&field7=1200 with my writing key, I can see that my entries increases.

Can someone help me, what could be the problem here?

Code is below:

#include "ThingSpeak.h"
#include
#include
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};
EthernetClient client;
// On Arduino: 0 - 1023 maps to 0 - 5 volts
#define VOLTAGE_MAX 5.0
#define VOLTAGE_MAXCOUNTS 1023.0

unsigned long myChannelNumber = XXXXXX;
const char * myWriteAPIKey = "XXXXXXXXXXXXXXXX";

void setup()
{
Serial.begin(9600);
Ethernet.begin(mac);
ThingSpeak.begin(client);
}

void loop()
{
// int sensorValue = analogRead(A0);
int sensorValue = random(0,1023);
float voltage = sensorValue * (VOLTAGE_MAX / VOLTAGE_MAXCOUNTS);
Serial.println(sensorValue);
Serial.println(voltage);

// Write to ThingSpeak. There are up to 8 fields in a channel, allowing you to store up to 8 different
// pieces of information in a channel. Here, we write to field 1.
ThingSpeak.writeField(myChannelNumber, 1, voltage, myWriteAPIKey);
delay(20000); // ThingSpeak will only accept updates every 15 seconds.