Banned account

[KR3ND31]

Code that causes the issue

async def is_account_session_valid(self) -> TelegramClient | None:
    """Checks the validity of a session, including proxy and connection to Telegram servers."""

    proxy = None
    if self.proxy:
        proxy = (
            self.proxy.proxy_type, self.proxy.ip, self.proxy.port, True, self.proxy.username, self.proxy.password)

        if not self.proxy.check_proxy():
            print(f"Error. Proxy is not working")
            return None

    try:
        client = TelegramClient(StringSession(self.session_string), self.api_id, self.api_hash, proxy=proxy,
                                device_model=self.device_model, system_version=self.system_version,
                                app_version=self.app_version, lang_code=self.lang_code,
                                system_lang_code=self.system_lang_code)
        await client.connect()
        if not await client.is_user_authorized():
            print(f"Session is not authorized for account {self.telegram_id}")
            await client.disconnect()
            return None

        print(f"Session is valid for account {self.telegram_id}")
        return client  # Return connected TelegramClient
    except (SessionPasswordNeededError, Exception) as e:
        print(f"Error checking session for account {self.telegram_id}: {e}")
        return None

### Expected behavior

No ban

### Actual behavior

I have a pre-registered account through the mobile app. I successfully log into it using Telethon, with my phone and two-factor authentication. However, after running the code several times with this active session (StringSession), my account gets banned and deleted.

### Traceback

Proxy successfully checked via http://httpbin.org/ip. Ping: 574.9 ms
Session is not authorized for account 7184956349
Authorizing for account 7184956349
Authentication error: The used phone number has been banned from Telegram and cannot be used anymore. Maybe check https://www.telegram.org/faq_spam (caused by SendCodeRequest)

Telethon version

1.36.0

Python version

3.9.13

Operating system (including distribution name and version)

Win 10

Other details

No response

Checklist

• The error is in the library's code, and not in my own.
• I have searched for this issue before posting it and there isn't an open duplicate.
• I ran pip install -U https://github.com/LonamiWebs/Telethon/archive/v1.zip and triggered the bug in the latest version.

[Lonami]

#824