Connection problem with PostgreSQL and Airflow (Built via Docker-compose)

Question

I'm building a Airflow server from the official docker image:

curl -LfO "https://airflow.apache.org/docs/apache-airflow/2.3.0/docker-compose.yaml"

It creates an standard user (airflow) with standard password (airflow). I have been trying to connect to my Airflow DAG with a PostgresHook, but it keeps returning this:

[2022-05-18, 01:29:32 UTC] {base.py:68} INFO - Using connection ID 'postgres_db' for task execution.
[2022-05-18, 01:29:32 UTC] {taskinstance.py:1889} ERROR - Task failed with exception
Traceback (most recent call last):
  File "/home/airflow/.local/lib/python3.7/site-packages/airflow/operators/python.py", line 171, in execute
    return_value = self.execute_callable()
  File "/home/airflow/.local/lib/python3.7/site-packages/airflow/operators/python.py", line 189, in execute_callable
    return self.python_callable(*self.op_args, **self.op_kwargs)
  File "/opt/airflow/dags/etl_hover.py", line 35, in insert_data_to_table
    pg_conn = hook.get_conn()
  File "/home/airflow/.local/lib/python3.7/site-packages/airflow/providers/postgres/hooks/postgres.py", line 113, in get_conn
    self.conn = psycopg2.connect(**conn_args)
  File "/home/airflow/.local/lib/python3.7/site-packages/psycopg2/__init__.py", line 122, in connect
    conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
psycopg2.OperationalError: connection to server at "host.docker.internal" (192.168.65.2), port 5432 failed: FATAL:  password authentication failed for user "***"

And, this is the connection:

As you can see, It is pretty much a standard connection (I have created succesfully an entry point with the database api_db, by the way. But It keeps telling me something about a wrong password. Any ideas?