Google Chat Bot Not Sending Message to Chat

I set up a chatbot and it works, kinda. The email is sent when the slash command is used but other than that it does not send the card to the chat saying we received the request. What am I missing here?

function createMessage(voter, voteCount, shouldUpdate) {
  return {
    actionResponse: {
      type: shouldUpdate ? 'UPDATE_MESSAGE' : 'NEW_MESSAGE'
    },
    "cards": [{
      "header": {
        "title": "IM Support",
        "subtitle": "We have received your message",
        "imageUrl": "https://portal.oursite.net/assets/logoBlk.png",
        "imageStyle": "IMAGE"
      },
    }]
  };
}

function onMessage(e) {
  MailApp.sendEmail({
    to: "support@oursite.net",
    subject: "Subject",
    htmlBody: e.message.text,
  });
  if (e.message.slashCommand.commandId === '2') {
    return createMessage(e.user.displayName, 0);
  }
}

I have referenced the following:

• https://developers.google.com/hangouts/chat/reference/message-formats/events
• https://github.com/googleworkspace/hangouts-chat-samples/blob/master/apps-script/vote-text-bot/vote-text-bot.js
• https://developers.google.com/hangouts/chat/samples

It's obviously getting the info: