Программная почтовая активность WebChat не работает - сообщение не отправляется при нажатии кнопки

var mainBotConnection;

const { createStore, ReactWebChat } = window.WebChat;
const { createProvider } = window.ReactRedux;
const Provider = createProvider('webchat');
const Store = createStore();

// get a token
const RequestToken = async (user) => {
    ...
};

(async function () {
   RequestToken(agent)
        .then(token => {

            //init main chat bot
            mainBotConnection = window.WebChat.createDirectLine({token: token});

            ...

            //grab mainbot placeholder and put it on screen
            window.ReactDOM.render(
                <Provider store = {Store}>
                    <ReactWebChat
                        directLine = {mainBotConnection}
                        storeKey='webchat'
                        userID = {user.id}
                        username = {user.name}
                        styleOptions = {mainBotStyleOptions}
                    />
                </Provider>,
                document.getElementById('webchat'));

            // this message does not appear
            Store.dispatch({
                type: 'WEB_CHAT/SEND_MESSAGE',
                payload: { text: 'StartUp hello!' }
            });
        });
   
    // test button
    document.querySelector('#helpButton').addEventListener('click', () => {
        // this is successfully logged 
        console.info(`help button clicked`);
        
        // 'help' text does not appear in bot
        Store.dispatch({
            type: 'WEB_CHAT/SEND_MESSAGE',
            payload: { text: 'help' }
        });
        
        // this is also successfully logged 
        console.info(Store);
    });

    document.querySelector('#webchat').focus();
})().catch(err => console.error(err));