Steps to reproduce the issue

install Joomla 4
manually edit configuration.php add:

public $root_user = 'admin';

Login to the admin console

Note the message (Says its an ERROR message, should be a "Smack you in the face" Warning though, its not an error...

Click the link Select here to try to do it automatically.

Expected result

Note the message (Says its an ERROR message, should be a "Smack you in the face" Warning though, its not an error...

Clicking the link removes the $root_user param in JConfig / configuration.php

Actual result

System information (as much as possible)

Additional comments