QR code scanning problem with the api scan

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

When I am scanning the generated qr code provided by whatsapp.web.js i am not able to login to the server. It shows following error:

Invalid QR code Make sure you’re scanning a QR code displayed on WhatsApp app. If it continues to not work, update the app or refresh the page and try again

Expected behavior

As a user, I expected to login when I scan the qr code with code scanner in whatsapp mobile applicaiton

Steps to Reproduce the Bug or Issue

1. Initiate the whatsapp client like this:

const { Client, MessageMedia, LocalAuth } = require("whatsapp-web.js");
const whatsapp_client = new Client({
    qrTimeoutMs: 0,
    puppeteer: {
        headless: false,
        args: [
            "--no-sandbox",
            "--disable-setuid-sandbox",
            "--unhandled-rejections=strict",
            "--disable-dev-shm-usage",
            "--fast-start",
        ]
    },
    // session: sessionCfg,
    authStrategy: new LocalAuth({
        clientId: "uniqid"
    })
});

1. Send the qr code to frontend Here i am using socket.io to communicate with frontend

whatsapp_client.on("qr", qr => {
    socket.emit("qr", qr);
});

1. Generate QR code with any frontend library. Here i am using qrcode.js in javascript I also tried using phpqrcode/qrlib.php to generate barcode but still getting same problem 😦
2. Scan the QR code in whatsapp mobile application

Relevant Code

No response

Browser Type

Chromium

WhatsApp Account Type

Standard

Does your WhatsApp account have multidevice enabled?

Yes, I am using Multi Device

Environment

OS: Ubuntu 20 Phone OS: Android 8.1.0 whatsapp-web.js version: 1.16.6 WhatsApp Web version: 2.2218.8 Node.js Version v16.4.2

Additional context

No response

[sariful]

So the issue was when generating qrcode using php-qrlib or js qrcode (frontend), whatsapp is not recognising the code. Thanks @Yuri-Lima for sharing the solution

[Olinari]

same here, only happens when deployed to vercel.