[Python] Superset iframe login redirect

I'm trying to understand how one should be able to insert Superset's dashboards and charts inside another application. At the moment I am at this step: I have inserted the iframe of a chart inside my html page and I am presented with Superset login page; after I insert the credentials I am redirected again on the login page, without ever seeing the chart. What am I doing wrong ? Am I missing part of the picture here ?

Here's my superset_config.py

import logging
import os

SQLALCHEMY_DATABASE_URI="mysql+pymysql://superset:superset@127.0.0.1:3306/superset"

REDIS_HOST="localhost"
REDIS_PORT=6379

# Will allow user self registration, allowing to create Flask users from Authorized User
AUTH_USER_REGISTRATION = True

# The default user self registration role
AUTH_USER_REGISTRATION_ROLE = "Public"

# Flask-WTF flag for CSRF
WTF_CSRF_ENABLED = False


And here's the basic html page I built with the iframe

<!DOCTYPE html>
<html>
<body>

<h1>iframe integration</h1>

<iframe
width="800"
height="800"
seamless
frameBorder="0"
scrolling="yes"
src="http://<remote server hostname>:8088/superset/explore/?r=2&standalone=true&height=400"
>
</iframe>

</body>
</html>


When I enter the html page from Firefox I see the login page, like in the picture below



When I insert the credentials I am redirected to the same login page.

This is what I see from Superset's logs

INFO:werkzeug:<my ip>- - [07/Apr/2021 13:12:07] "POST /login/?next=http%3A%2F%2F<remote server hostname>%3A8088%2Fsuperset%2Fexplore%2F%3Fr%3D2%26standalone%3Dtrue%26height%3D400 HTTP/1.1" 302 -
INFO:werkzeug:<my ip> - - [07/Apr/2021 13:12:07] "GET / HTTP/1.1" 302 -
INFO:werkzeug:<my ip> - - [07/Apr/2021 13:12:07] "GET /superset/welcome HTTP/1.1" 302 -
INFO:werkzeug:<my ip> - - [07/Apr/2021 13:12:07] "GET /login/ HTTP/1.1" 200 -

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