on the registration page, the table being used is the users table, and the name of the session being created is SecurityAssist_UserID the first few lines of the insert behavior set this:
// WA DataAssist Insert
if ((isset($_POST["Registration_submit"]) && $_POST["Registration_submit"] != "")) // Trigger
$WA_connection = $classroomConn;
$WA_table = "users";
$WA_sessionName = "SecurityAssist_UserID";
when you click the link in the email, what is the full address in the address bar, I'm betting the email or ID are missing from the URL which is causing the rsVerify recordset to be blank.