My module file is not returning anything to the main file.

Does it have to do with callbacks?

login.js:

// ...
async function request(url) {
    return await axios.post(url).then(res => {return res})
}

function accessToken() {
  var url = generateRequestURL()
  var response = request(url)
  response.then(function(result) {
      var responseData = result.data
      var parsed = parser.parse(responseData)
      var error = 'Could not generate access token.'
      
      var isError = parsed[0].attributes.errorMessage
      if (isError) {
        return error
      } else {
        var tokenGenerated = parser.parse(parsed[0].innerXML)
        var token = tokenGenerated[0].attributes.accessToken
        return token
      }
  })
}

module.exports = accessToken

index.js:

const token = require('./login.js')
const accessToken = token()

console.log(accessToken) // this returns undefined

Any help is appreciated!