enableTwoFactor - EResult code 2

[DCFrog]

Describe the bug

Getting EResult code 2 (FAIL) when trying to enable Steam Guard using enableTwoFactor method.
What I have tried so far:

• Removing email verification (completely disabled Steam Guard) - same error
• Using another IP address (not a VPN, legitimate residential IP) - same error
• Enabling Steam Guard from a physical phone (iPhone) - was able to setup Steam Guard without any issues

Versions

NodeJS v20.19.5 (MacOS)
steam-user v5.3.0 / (tried older versions as well, same issue)

Code snippet I'm using

const readline = require('node:readline');
const SteamUser = require('steam-user');

(() => {
  const username = `USERNAMEHERE`;
  const password = `PASSWORDHERE`;

  console.log(`Enabling 2FA for account ${username}`);

  let client = new SteamUser();

  client.logOn({
    accountName: username,
    password: password,
  });

  client.on('loggedOn', (_details) => {
    console.log('Logged into Steam as ' + client.steamID.getSteam3RenderedID());

    client.enableTwoFactor((err, response) => {
      if (err) {
        console.error(err);
        return;
      }


      if (response.status != SteamUser.EResult.OK) {
        console.error(`EResult: ${response.status}`);
        return;
      }

      const responseJSON = JSON.stringify(response, null, 4);
      console.log(`\n${responseJSON}\n`);

      const rl = readline.createInterface({
        input: process.stdin,
        output: process.stdout,
      });

      rl.question(`Steam Guard Code: `, (code) => {
        console.log(`Code used: ${code}!`);
        rl.close();

        client.finalizeTwoFactor(response.shared_secret, code, (err) => {
          if (err) {
            console.error(err);
            return;
          }

          console.log(`2FA enabled, save JSON string for recovery!`);
        });
      });
    });
  });
})();

Screenshots and Error Logs

➜  steam-totp-enabler git:(main) ✗ node index.js
Enabling 2FA for account [REDACTED]
Logged into Steam as [U:1:REDACTED]
EResult: 2

Any ideas what can cause EResult = 2?
I was using the same script (like 8-9 months before) and it always was working without a single issue, today I wanted to enable Steam Guard on one of my accounts and faced this issue.

[vadzimshpak]

Seems like you need to attach mobile via sms to account to use this

[DCFrog]

Seems like you need to attach mobile via sms to account to use this

But before this was working without any attached phone numbers.. I have previously enabled 2FA on like ~50 accounts without a single issue.

And also - you can enable SteamGuard using a real device without having to attach phone number.