Cannot get access token.

Here is my solution:

const axios = require('axios');
const adal = require('adal-node');


const getAccessToken = () => {
  const config = {
    username: 'Your Username',
    password: 'Your Password',
    clientId: 'Your Client ID',
    resource: 'https://analysis.windows.net/powerbi/api'
  }

  const authority = 'https://login.microsoftonline.com/Your Tenant'; 
  // Tenant can be found in the Azure Portal.
  // When you access Azure AD, it should show your the name of your tenant.
  // Don't have a link but you can figure out where to get this with some googling.


  let context = new adal.AuthenticationContext(authority, true)
  const callback = (err, accessToken) => {
    if (!err) {
      console.log(accessToken.accessToken); // Returns access token.
      makeApiCall(accessToken.accessToken); --> This is my actual API call.
    } else {
      console.log(err);
    }
  }
  context.acquireTokenWithUsernamePassword(
    config.resource,
    config.username,
    config.password,
    config.clientId,
    callback
  );
}

const makeApiCall = (token) => {
  const config = {
    headers: {
      'Authorization': "Bearer " + token,
      'Content-Type': 'application/x-www-form-urlencoded',
      'Accept': 'application/json'
    }
  };

   // These options are only used when generating a embedToken.

  //{
    //accessLevel:"View",
    //allowSaveAs:"false"
  //}, 

  const url = 'https://api.powerbi.com/v1.0/myorg/groups/5cfa7118-e1eb-4008-afe7-239e5286b9f1/reports/';


  axios.get(url, config)
    .then(response => {
      let result = response.data;
      console.log(result);
    })
    .catch(err => {
      console.log(err);
      console.log(err.response.status);
      console.log(err.response.statusText);
    })
}

getAccessToken();