How to link my discord bot (.py) to my managed MySQL database. (Ubuntu 20.04)

I was following this tutorial (https://www.digitalocean.com/community/tutorials/how-to-connect-to-managed-database-ubuntu-18-04#connecting-to-a-managed-mysql-database) and despite this when I start my bot it gives me this error.

Traceback (most recent call last):
  File "/home/peppe/.venvs/discord/lib/python3.8/site-packages/mysql/connector/connection_cext.py", line 232, in _open_connection
    self._cmysql.connect(**cnx_kwargs)
_mysql_connector.MySQLInterfaceError: Can't connect to MySQL server on 'discordbotdatabase....com:3306' (4)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "LMIIBotDevelopment.py", line 29, in <module>
    lmiibot_db = mysql.connector.connect(
  File "/home/peppe/.venvs/discord/lib/python3.8/site-packages/mysql/connector/__init__.py", line 272, in connect
    return CMySQLConnection(*args, **kwargs)
  File "/home/peppe/.venvs/discord/lib/python3.8/site-packages/mysql/connector/connection_cext.py", line 85, in __init__
    self.connect(**kwargs)
  File "/home/peppe/.venvs/discord/lib/python3.8/site-packages/mysql/connector/abstracts.py", line 1003, in connect
    self._open_connection()
  File "/home/peppe/.venvs/discord/lib/python3.8/site-packages/mysql/connector/connection_cext.py", line 232, in _open_connection
    self._cmysql.connect(**cnx_kwargs)
KeyboardInterrupt

This is the code I use to connect it

import mysql.connector

lmiibot_db = mysql.connector.connect(
    host="discordbotdatabase...com",
    user="doadmin",
    passwd="password",
    database="lmiibot",
    auth_plugin="mysql_native_password",
)

How could I do? I’m going crazy