Xsuite HTML WebSSO is only supporting automatic login to a web portal which is employing HTML-based "input" and "button" controls e.g.
<form action="/action_page.php" method="get">
Username: <input type="text" name="fname"><br>
Password: <input type="text" name="lname"><br>
<button type="submit" value="Submit">Submit</button>
<button type="reset" value="Reset">Reset</button>
To confirm this is the case in your web portal, please load the page in your native Web Browser and view the source code of the page.
While running the Learn Mode make sure all the relevant controls are all green circled upon marking these as Accountname Field, Password Field and Submit Button as shown in below example.
Should this not be the case then it is indicating that the Xsuite HTML WebSSO method is not recognising the control correctly.