Telegram Login works in Firefox but not Chrome/Edge

I am using the Telegram Login Widget on my Vercel website:

https://sugar-gram.vercel.app/web/chatgptSoloLogin.html

sugar-gram.vercel.app

The bot is .

In BotFather, the domain is configured correctly and it says: Web login is currently available on sugar-gram.vercel.app for SugarGram .

The interesting part is that Telegram Login works correctly in Firefox. IdmHR1d 1Tl5Xec When I log in from Firefox, Telegram authenticates me and my website receives the user data correctly. I can see the Telegram user information printed on the page.

However, the exact same website does not work in Chrome or Edge when I try to log in with a different Telegram account/phone number.

The flow is: I click "Log in with Telegram". Telegram asks me for my phone number. I enter another valid Telegram phone number. Telegram displays: We have sent you a message. Confirm access via Telegram Vr02CKI However, no confirmation message arrives in Telegram. The login never completes.

This is especially strange because the same Telegram Login Widget works correctly in Firefox.

I have already confirmed that the domain is configured in BotFather.

<!DOCTYPE html>

Login Telegram - SugarGram


    * {
        box-sizing: border-box;
    }

    body {
        margin: 0;
        min-height: 100vh;
        display: flex;
        align-items: center;
        justify-content: center;
        font-family: Arial, sans-serif;
        background: #f5f5f5;
    }

    .login-container {

        width: 100%;
        max-width: 400px;
        padding: 30px;
        text-align: center;
        background: white;
        border-radius: 12px;
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.10);
    }

    h1 {
        margin: 0 0 10px;
    }

    p {
        margin: 0 0 25px;
        color: #666;
    }

    #telegram-login {
        display: flex;
        justify-content: center;
    }

    #resultado {
        margin-top: 20px;
        text-align: left;
        word-break: break-word;
        font-size: 13px;
    }

SugarGram

Inicia sesión con Telegram

function onTelegramAuth(user) {

console.log("Usuario Telegram:", user);

document.getElementById("resultado").innerHTML =
    "**Login correcto**

" + "ID: " + (user.id || "") + "
" + "Nombre: " + (user.first_name || "") + "
" + "Usuario: @" + (user.username || "");

/*
 * Más adelante aquí podemos enviar user al PHP:
 *
 * fetch("loginTelegram.php", {
 *     method: "POST",
 *     headers: {
 *         "Content-Type": "application/json"
 *     },
 *     body: JSON.stringify(user)
 * });
 */

}



Could this be related to browser cookies, third-party cookies, local storage, popup handling, browser fingerprinting, Telegram's authentication session, or some Chrome/Edge-specific restriction?

Is there any Telegram Login configuration or browser-specific issue that could explain why Firefox works but Chrome/Edge does not?

Login Telegram - SugarGram * { box-sizing: border-box; } body { margin: 0; min-height: 100vh; display: flex; align-items: center; justify-content: center; font-family: Arial, sans-serif; background: #f5f5f5; } .login-container {

width: 100%; max-width: 400px; padding: 30px; text-align: center; background: white; border-radius: 12px; box-shadow: 0 4px 20px rgba(0, 0, 0, 0.10); } h1 { margin: 0 0 10px; } p { margin: 0 0 25px; color: #666; } #telegram-login { display: flex; justify-content: center; } #resultado { margin-top: 20px; text-align: left; word-break: break-word; font-size: 13px; }

/* * Más adelante aquí podemos enviar user al PHP: * * fetch("loginTelegram.php", { * method: "POST", * headers: { * "Content-Type": "application/json" * }, * body: JSON.stringify(user) * }); */

Could this be related to browser cookies, third-party cookies, local storage, popup handling, browser fingerprinting, Telegram's authentication session, or some Chrome/Edge-specific restriction? Is there any Telegram Login configuration or browser-specific issue that could explain why Firefox works but Chrome/Edge does not?