No devices detected with Seeeduino Xiao

[Sercurio]

I tried jpliew answer here
Originally posted by @jpliew in #91 (comment)

And tried that

Hi, I have not succeeded to access my Xiao trough web browser despite the information up there. The sketch compiles but no devices are found in the web browser.

Someone can help ?

My config: platformio.ini

[env:seeed_xiao]
platform = atmelsam
board = seeed_xiao
framework = arduino
lib_deps = 
	; arduino-libraries/MIDIUSB@^1.0.5
	adafruit/Adafruit TinyUSB Library@0.10.5
monitor_speed = 115200
board_build.usb_product = "MIDIPots"
build_flags =
   -DUSE_TINYUSB
lib_archive = no

the sketch

/*********************************************************************
 Adafruit invests time and resources providing this open source code,
 please support Adafruit and open-source hardware by purchasing
 products from Adafruit!

 MIT license, check LICENSE for more information
 Copyright (c) 2019 Ha Thach for Adafruit Industries
 All text above, and the splash screen below must be included in
 any redistribution
*********************************************************************/

/* This sketch demonstrates WebUSB as web serial with browser with WebUSB support (e.g Chrome).
 * After enumerated successfully, Browser will pop-up notification
 * with URL to landing page, click on it to test
 *  - Click "Connect" and select device, When connected the on-board LED will litted up.
 *  - Any charters received from either webusb/Serial will be echo back to webusb and Serial
 *  
 * Note: 
 * - The WebUSB landing page notification is currently disabled in Chrome 
 * on Windows due to Chromium issue 656702 (https://crbug.com/656702). You have to 
 * go to landing page (below) to test
 * 
 * - On Windows 7 and prior: You need to use Zadig tool to manually bind the 
 * WebUSB interface with the WinUSB driver for Chrome to access. From windows 8 and 10, this
 * is done automatically by firmware.
 */
#include <Arduino.h>
#include "Adafruit_TinyUSB.h"

// USB WebUSB object
Adafruit_USBD_WebUSB usb_web;

// Landing Page: scheme (0: http, 1: https), url
WEBUSB_URL_DEF(landingPage, 1 /*https*/, "adafruit.github.io/Adafruit_TinyUSB_Arduino/examples/webusb-serial/index.html");

int led_pin = LED_BUILTIN;

void line_state_callback(bool connected);

// the setup function runs once when you press reset or power the board
void setup()
{
  pinMode(led_pin, OUTPUT);
  digitalWrite(led_pin, LOW);
  
  usb_web.setLandingPage(&landingPage);
  usb_web.setLineStateCallback(line_state_callback);
  //usb_web.setStringDescriptor("TinyUSB WebUSB");
  usb_web.begin();

  Serial.begin(115200);

  // wait until device mounted
  while( !USBDevice.mounted() ) delay(1);

  Serial.println("TinyUSB WebUSB Serial example");
}

// function to echo to both Serial and WebUSB
void echo_all(char chr)
{
  Serial.write(chr);
  // print extra newline for Serial
  if ( chr == '\r' ) Serial.write('\n');
  
  usb_web.write(chr);
}

void loop()
{
  // from WebUSB to both Serial & webUSB
  if (usb_web.available()) echo_all(usb_web.read());

  // From Serial to both Serial & webUSB
  if (Serial.available())   echo_all(Serial.read());  
}

void line_state_callback(bool connected)
{
  digitalWrite(led_pin, connected);

  if ( connected ) usb_web.println("TinyUSB WebUSB Serial example");
}

The build output

Processing seeed_xiao (platform: atmelsam; board: seeed_xiao; framework: arduino)
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Verbose mode can be enabled via `-v, --verbose` option
CONFIGURATION: https://docs.platformio.org/page/boards/atmelsam/seeed_xiao.html
PLATFORM: Atmel SAM (8.1.0) > Seeeduino XIAO
HARDWARE: SAMD21G18A 48MHz, 32KB RAM, 256KB Flash
DEBUG: Current (atmel-ice) External (atmel-ice, blackmagic, jlink)
PACKAGES: 
 - framework-arduino-samd-seeed @ 1.8.1 
 - framework-cmsis @ 2.50400.181126 (5.4.0) 
 - framework-cmsis-atmel @ 1.2.2 
 - toolchain-gccarmnoneeabi @ 1.70201.0 (7.2.1)
LDF: Library Dependency Finder -> https://bit.ly/configure-pio-ldf
LDF Modes: Finder ~ chain, Compatibility ~ soft
Found 34 compatible libraries
Scanning dependencies...
Dependency Graph
|-- Adafruit TinyUSB Library @ 0.10.5
Building in release mode
Checking size .pio/build/seeed_xiao/firmware.elf
Advanced Memory Usage is available via "PlatformIO Home > Project Inspect"
RAM:   [=         ]  12.4% (used 4060 bytes from 32768 bytes)
Flash: [=         ]   6.6% (used 17268 bytes from 262144 bytes)
====================================================================== [SUCCESS] Took 1.44 seconds ======================================================================
 *  Terminal will be reused by tasks, press any key to close it. 

The web page