Outlook Javascript Add-In: "ItemSend" Event doest trigger on outlook for windows, why?

I created an outlook plugin that i'm testing on local enviroment. the plugin is working when user is composing new message. I have a function that is supposed to be triggered on item send.

The thing is that the event us not triggering only for outlook on windows:

1. "outlook for the web" - Works fine!
2. Outlook for mac - Works fine!
3. Outlook for windows - doesnt work!! (event doesnt trigger)

Heres my xml event:

<ExtensionPoint xsi:type="Events">
    <Event Type="ItemSend" FunctionExecution="synchronous" FunctionName="checkBodyOnlyOnSendCallBack" />
</ExtensionPoint>

I tested it even in vorlon debuggger and i see my console log when the add-in is lunched, but not when item is sent, (heres my code and a screen shot to see that the office.onReady is doing console.log('9999') , but "checkBodyOnlyOnSendCallBack" function in not doing console.log()):

  Office.onReady(function(reason){ 
    mailboxItem = Office.context.mailbox.item;
    console.log('9999')
  });
  
  function checkBodyOnlyOnSendCallBack(event) {
    console.log('vvvv')
  }

this is my outlook version on windows:

ANY HELP?