[apps] Adaptive Card Submit Invoke Error

[aacebo]

submit invoke is successful and the handler is called, but the client shows "unable to reach app. Please try again" message.

app.on("card.action", async ({ activity, send }) => {
  logger.debug("Receive card action from teams", activity);
  
  return {
    status: 200,
    type: "application/vnd.microsoft.activity.message",
    value: "Got it!",
  };
});