Why I can't connect google functions to Mysql?

I created a google function to connect to Mysql, I created the database using Cloud SQL. I gave it Cloud permissions.Here's the code inside my 1st gen function (main.py). Please keep in mind "" actually have my keys

import osfrom google.cloud.sql.connector import Connector, IPTypesimport pymysqlimport sqlalchemydef connect_with_connector() -> sqlalchemy.engine.base.Engine:"""    Initializes a connection pool for a Cloud SQL instance of MySQL.    Uses the Cloud SQL Python Connector package."""    instance_connection_name = os.environ[""    ]  # 'project:region:instance'    db_user = os.environ[""]  #  'my-db-user'    db_pass = os.environ[""]  #  'my-db-password'    db_name = os.environ[""]  #  'my-database'    ip_type = IPTypes.PRIVATE if os.environ.get("PRIVATE_IP") else IPTypes.PUBLIC    connector = Connector(ip_type)    def getconn() -> pymysql.connections.Connection:        conn: pymysql.connections.Connection = connector.connect(            instance_connection_name,"pymysql",            user=db_user,            password=db_pass,            db=db_name,        )        return conn    pool = sqlalchemy.create_engine("mysql+pymysql://",        creator=getconn,        # ...    )    return pool

As entry point I have 'connect_with_connector'On requierements.txt I have

google-cloud-sql-connectorpymysqlsqlalchemy

I followed this documentationhttps://cloud.google.com/sql/docs/mysql/connect-functionsThere's not important information on logs.