Amazon Lex v2: After fulfilment, the next action "Closing Response" not working

Hello there!

I have trying to create a chatbot with Amazon Lex V2. Im was adjusting the behavior of the bot i encountered with a issue.

I have this flow => Initial Response → Confirmation → Fulfillment (Using a lambda) → Closing Response (X) → End conversation

The fulfillment works as expected, the lambda return the answer to the user/client. So, has next step, i put in Success Response in Fulfillment to redirect to Closing Response. It doens't work

This is the response that i send from the lambda in the fulfillment step:

    sessionState: {
        sessionAttributes: '...',
        dialogAction: {
            type: 'Close',
        },
        intent: {
            name: 'SendCVByEmail',
            state: 'Fulfilled'
        },
    },
    messages: [
        {
            contentType: 'PlainText',
            content: 'sending cv...'
        },
    ],

So.. what could be the reason of the behavior that i explain above? and how to solve it?

I tried to use in type of dialogAction: "Delegate" but still the same.