AutoIT Windows Authentication with Chrome default popup

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Hi everybody, 

I'm new in this forum, but I've been using autoit for a while now.

I've a problem about the windows authentication automation on a web application. My script is:

$URL ="[CHROME .EXE PATH]\chrome.exe --incognito --no-first-run --no-default-browser-check --start-fullscreen --ignore- certificate-errors --app=" & $TargetAddress
$ConnectionClientPID = Run($URL)
Sleep(500)
Send($TargetUsername)
Sleep(500)
Send("{TAB}")
Send($TargetPassword, 1)
Sleep(500)
Send("{ENTER}")

But when I run this script, the authentication fails and the message 401 Unauthorized appears (this message appears when you click on CANCEL or you press on ESC, so it is as if the script, after entering the password, "makes" two TABs to click on Cancel). But I think I wrote the right TAB and ENTER. What is wrong with this?