Get OAuth 2.0 Token from personnal accounts (Outlook)

I am trying to use @azure/msal-node on a node backend server.  all work fine for business accounts onmicrosoft.com but not for personnal accounts like outlook.com

according to this documentation, Authentication seems to be possible https://docs.microsoft.com/en-us/exchange/client-developer/legacy-protocols/how-to-authenticate-an-imap-pop-smtp-application-by-using-oauth

But i don't understand if my problem come from azure AD configuration or from my code. 

exp.post('/connect', function (req, res) {
  let authCodeUrlParameters = {
    scopes: SCOPES_OUTLOOK,
    redirectUri: "http://localhost:4220/redirect",
  };
  publicMicrosoftClient.getAuthCodeUrl(authCodeUrlParameters).then((response) => {
    if (req.body.email) {
      response += `&login_hint=${req.body.email}`
    }
    open(response)
  }).catch((error) => console.log(JSON.stringify(error)));
});

exp.get('/redirect', async function (req, res) {
  try {
    const form = {
      'code': req.query.code,
      'client_id': CLIENT_ID_OUTLOOK,
      'scope': SCOPES_OUTLOOK.join(' '),
      'redirect_uri': 'http://localhost:4220/redirect',
      'grant_type': 'authorization_code',
      'client_secret': encodeURI(SECRET_VALUE_OUTLOOK),
    }

    const options = {
      url: 'https://login.microsoftonline.com/common/oauth2/v2.0/token',
      headers: {
        'Content-Type': 'application/x-www-form-urlencoded',
      },
      method: 'post',
    }

    response = await got(options, { form });
    respToken = response.body
    ...
  } catch (error) {
    console.log(error)
    res.end();
  }
});

the error come from ...v2.0/token request. the server response doesn't really help (error 400 bad request)

in azure AD we have app registered and all required scope with status granted. Thank you in advance for your help, Yan