there’s a problem I haven’t been able to solve for several hours

client = TelegramClient('session_name', api_id, api_hash)

async def generate_qr():
    try:
        await client.start()

        qr_login = await client.qr_login()

        print(qr_login.expires)

        qr_url = qr_login.url

        if qr_url:
            img = qrcode.make(qr_url)
            print(qr_url)
            img.save("login_qr.png")
            print("QR code saved as login_qr.png")

            user = await qr_login.wait()
            print(f"Logged in as: {user.first_name}")

            print(f"Token: {urlsafe_b64encode(qr_login.token).decode('utf-8')}")
        else:
            print("Failed to generate QR code URL.")
        
    except Exception as e:
        print(f"An error occurred: {e}")

client.loop.run_until_complete(generate_qr())

The code generates a QR code and waits for it to be scanned so that the user can log in, allowing our client to interact with the Telegram API on behalf of the user.

Exporting a login token

First of all, auth.exportLoginToken must be called by the app that wants to log in to an existing Telegram account. The method will return an auth.loginToken constructor, containing a binary login token and an expiration date (usually 30 seconds).

The login token must be encoded using base64url, embedded in a tg://login?token=base64encodedtoken URL, and shown in the form of a QR code to the user. After the expiration of the current QR code, the auth.exportLoginToken method must be recalled, and a new QR code must be generated automatically.

Accepting a login token

In order to log in, the QR code must be scanned and accepted by an already logged-in Telegram app using auth.acceptLoginToken. The token must be extracted from the tg://login URI and base64url-decoded before using it in the method.

Possible errors returned by the method are:

400 - AUTH_TOKEN_INVALID: an invalid authorization token was provided
400 - AUTH_TOKEN_EXPIRED: the provided authorization token has expired, and the updated QR code must be re-scanned
400 - AUTH_TOKEN_ALREADY_ACCEPTED: the authorization token was already used
The method will return an authorization object containing info about the app and session that we just authorized.

Confirming (importing) the login token

After the logged-in app calls auth.acceptLoginToken and accepts the login token, the app that is trying to log in will receive an updateLoginToken update, which should trigger a second call to the auth.exportLoginToken method.

This second call should then return an auth.loginTokenSuccess constructor, indicating successful login, essentially allowing further authorized interaction with the API.

If, however, there is a DC mismatch between the two apps, auth.loginTokenMigrateTo is returned instead, to which the app that is trying to log in should respond by calling auth.importLoginToken with the specified token, to the specified DC.

This call should then finally return an auth.loginTokenSuccess constructor.

In the documentation, we see that the client, during the QR code scanning, actually sends a request (the token written in the QR code) to the auth.acceptLoginToken method.

The only problem is that during the scan, I receive the response

AUTH_TOKEN_ALREADY_ACCEPTED

which means someone has already sent the token to this method. Has anyone else encountered this problem and can you tell me what I am doing wrong?

https://docs.telethon.dev/en/stable/modules/client.html#telethon.client.auth.AuthMethods.qr_login
https://docs.telethon.dev/en/stable/modules/custom.html#telethon.tl.custom.qrlogin.QRLogin
https://core.telegram.org/api/qr-login