Here is where I am stuck:
I have the platformio.ini file like this:

[env:m5stack-cores3]
platform = espressif32
board = m5stack-cores3
framework = arduino

lib_deps =
m5stack/M5Dial
m5stack/M5GFX
m5stack/M5Unified

upload_speed = 115200
monitor_speed = 115200

and my main.cpp program is simply:

#include <Arduino.h>

#include "M5Dial.h"
#include <WiFi.h>
#include <M5GFX.h>

void setup() {
// put your setup code here, to run once:
auto cfg = M5.config();
M5Dial.begin(cfg, true, true);
M5Dial.Display.setBrightness(34);
M5Dial.Display.fillScreen(0xABE1);
M5Dial.Display.setTextDatum(4);
Serial.print("Test");
}

void loop() {
// put your main code here, to run repeatedly:
}

Everything compiles and uploads but screen is blank. Serial monitor equivalent complains about a lot.

Did I choose the wrong board?
board = m5stack-cores3