Sadly, it does not work, still get
This server could not verify that you are authorized to access the document requested. Either you supplied the wrong credentials (e.g., bad password), or your browser doesn't understand how to supply the credentials required.
Ah no sorry there is another issue, namely that you are not in the nda LDAP group. What it is currently failing is not superset, but the httpd's LDAP auth in front of it (that requires the user to be either in wmf or nda). We'll need to create a task like https://phabricator.wikimedia.org/T188105