Unable to use multiple proxies with puppeteer

What is the best way to set up multiple proxies with puppeteer? I tried the following:

const puppeteer = require('puppeteer');

(async () => {
    const proxies = [
        'socks5://myusername:mypassword@myhost:myport',
        'socks5://myusername:mypassword@myhost:myport',
        'socks5://myusername:mypassword@myhost:myport'
    ];

    const openWindow = async (proxyUrl) => {
        const browser = await puppeteer.launch({
            headless: false,
            args: [`--proxy-server=${proxyUrl}`]
        });

        const page = await browser.newPage();
        page.setDefaultNavigationTimeout(0);

        await page.authenticate({
            username: 'myusername', // Replace with your proxy username
            password: 'mypassword' // Replace with your proxy password
        });

        await page.setViewport({
            width: 992,
            height: 607
        });

        await page.goto('https://dnsleaktest.com');

        console.log(`Window opened with proxy: ${proxyUrl}`);

          };

    // Open windows with proxies
    for (const proxy of proxies) {
        // Open multiple windows per proxy
        for (let i = 0; i < 3; i++) {
            await openWindow(proxy);
        }
    }

    console.log('All windows opened.');
})();

However, it does not work and I get the following message instead:

Error: net::ERR_NO_SUPPORTED_PROXIES at https://dnsleaktest.com

Background: The application previously worked with a single proxy configuration, but the issue arose when attempting to introduce support for multiple proxies.
Each scraper instance runs in its Chrome window, with one proxy configured per window for isolation and parallel scraping purposes.

Single Window Code:

const puppeteer = require('puppeteer');

const proxy = 'myip:myport';
const username = 'myusername';
const password = 'mypassword';

(async () => {
    // Pass proxy URL into the --proxy-server arg
    const browser = await puppeteer.launch({
        args: [`--proxy-server=${proxy}`],
        headless: false,
        ignoreHTTPSErrors: true
    });

    const page = await browser.newPage()
    page.setDefaultNavigationTimeout(0);

    // Authenticate your proxy with the username and password defined above
    await page.authenticate({ username, password });

    await page.goto('https://dnsleaktest.com');

    
})();