First time login don't work until I use the login details in test tool

Firstly, I will like to say thanks you for the plugin. Fantastic!

But I noticed a glitch that I am not sure how to solve. Anytime a user is login in for the first time, the login is not successful. Until I use that same login details in the test tool in the setting page. After which login is then successful on the site login.

Of course I can’t always login on test tool for every new user before that can login, so I am guessing there is something i am missing.

Basically, I want any user that is on AD to be able to login to the site even if they are not on wp user list and get created after their first login to the site.

Cool stuff guys!

http://wordpress.org/plugins/active-directory-authentication-integration/