Bad Request: chat not found, error_code:400, i am have issue while sending message on telegram

I am working on a project where I want to send all the reminders due in 3 days from now, but I am facing a problem. I have an error code 400 while sending the message on Telegram (for which I am using a Telegram bot)

This is the Code

def send_message(message, id):
    url = f"https://api.telegram.org/bot{BOT_TOKEN}/sendMessage"
    response = requests.post(url, data={
                "chat_id": id,
                "text": message,
                "parse_mode": "Markdown"
            })
    print("Telegram Response:", response.text)
    return response.status_code

def send_due_reminders():
    today = datetime.today().date()
    
    try:
        conn, cursor = database_con()

        # 1. Check last update date
        cursor.execute("SELECT * FROM update_mess WHERE id = %s", ('reminders',))
        result = cursor.fetchone()
        print(result)

        if result:
            last_updated = result[2]
            telegram_id = int(result[1])
        else:
            return "No 'reminders' row found in update_mess table."

        if last_updated == today:
            return "Reminders already sent today."

        if not telegram_id:
            return "Telegram ID is not set."

        # 2. Get due reminders
        threshold_date = today + timedelta(days=3)
        cursor.execute("""
            SELECT id, title, task_detail, due_date, assigned_to
            FROM reminders
            WHERE status = 'Pending' AND due_date <= %s
        """, (threshold_date,))
        reminders = cursor.fetchall()

        if not reminders:
            return "No due reminders within 3 days."

        # 3. Format and send message
        message = "🔔 Upcoming Reminders (Due in 3 Days)\n\n"
        for r in reminders:
            message += (
                f"📌 Title: {r[1]}\n"
                f"📝 Task: {r[2]}\n"
                f"👤 Assigned To: {r[4]}\n"
                f"📅 Due Date: {r[3]}\n\n"
            )

        print(len(message))

        response = send_message(telegram_id, message)

        if response == 200:
            status = "Reminders were sent to Telegram successfully!"
        else:
            status = f"Telegram send failed with status code: {response}"

        # 4. Update last_updated
        cursor.execute("UPDATE update_mess SET last_updated = %s WHERE id = %s", (today, 'reminders'))
        conn.commit()

        return status

    except Exception as err:
        return f"Error: {err}"

    finally:
        cursor.close()
        conn.close()

Output

('reminders', '62XXXXXXX', datetime.date(2025, 6, 2))

len of mess:652

Telegram Response: {"ok":false,"error_code":400,"description":"Bad Request: chat not found"}

What I have tried

The telegram ID is working. I have tried the same ID in different parts of the project, where it sends reminder details on completion, updating, and creation of the reminder

I have changed message to plain message so it does not mess with the "Markdown" part of the code "parse_mode": "Markdown"

I have checked if the message is not too long len of mess: 652, and I guess this is not that big (chatGPT told me we can send 4096 characters)

At this point I don't know what is the problem

You've defined your send function as:

def send_message(message, id):

But you call it like

response = send_message(telegram_id, message)

So you're using the message as id and vice versa.

Can imagine that that chat can't be found ;)

Lets swap the function parameter's:

def send_message(id, message):

Note: You should not use id as variable, it's a build-in function in Python that can cause issues: Is `id` a keyword in python?