How to get rid of the message "Your user name may be the same as your email address"

[saulkarl]

I am using the data manager to create a new user:

$newuser =& datamanager_init('User', $vbulletin, ERRTYPE_ARRAY);
$newuser->set('username', $userInfo->first_name . ' ' . $userInfo->last_name);
$newuser->set('email', $userInfo->email);
$newuser->set('password', fetch_random_password(8));
$newuser->set('usergroupid', 2);
$newuser->pre_save();
if (empty($newuser->errors)) {
  $userId = $newuser->save();
}

However, after I login with this new user, there's a message:

Your user name may be same as your email address. To avoid leaking your email address.

But the username is clearly not the same as the email address.

I am not able to find this message in the code so I suspect this message is stored in the db somewhere.

What is the proper way to create a new user without this message showing up upon login? Sorry I am very new to vbulletin programming.