postMessageToUser does not Work

[kodekage]

postMessageToUser does not Work

[a007mr]

I have the same problem. bot.postMessageToUser(user, message) doesn't work.

My code:

bot.on('message', data => {
  if (data.type !== 'message' || data.subtype === 'bot_message') {
    return;
  }

  handleMessage(data);
});

function handleMessage(data) {
  let user = data.user;     // I tried also user data.client_msg_id
  console.log(`user`, user);    // it shows somethings like `user UP23WKQXX`
  let message = data.text;

  if (message.includes(' help')) {
    runHelp(user);
  }
}

function runHelp(user) {
  bot.postMessageToUser(user, `message`);
}

bot.postMessageToUser(user, message) doesn't work. It gives error Assertion failed: user not found.

How to get user name?