Trying to access a variable from my service in my controller in AngularJS [duplicate]

I want to get some info about the currently logged in user, I have stored the variable in currentUser but nothing appears when I try to access it from my controller

authentication.service.js:

(function () {
  'use strict';

  angular
    .module('thinkster.authentication.services')
    .factory('Authentication', Authentication);


  Authentication.$inject = ['$cookies', '$http'];

  /**
  * @namespace Authentication
  * @returns {Factory}
  */
  function Authentication($cookies, $http) {
    /**
    * @name Authentication
    * @desc The Factory to be returned
    */


    var Authentication = {
      login: login,
      register: register,
      getAuthenticatedAccount: getAuthenticatedAccount,
      isAuthenticated: isAuthenticated,
      setAuthenticatedAccount: setAuthenticatedAccount,
      unauthenticate: unauthenticate,
      currentUser: ''
    };



    return Authentication;

    ////////////////////

    /**
    * @name register
    * @desc Try to register a new user
    * @param {string} username The username entered by the user
    * @param {string} password The password entered by the user
    * @param {string} email The email entered by the user
    * @returns {Promise}
    * @memberOf thinkster.authentication.services.Authentication
    */
    function register(email, password, username) {
      return $http.post('/api/v1/accounts/', {
        username: username,
        password: password,
        email: email,
      }).then(registerSuccessFn, registerErrorFn);

      function registerSuccessFn(data  ̶,̶ ̶s̶t̶a̶t̶u̶s̶,̶ ̶h̶e̶a̶d̶e̶r̶s̶,̶ ̶c̶o̶n̶f̶i̶g̶ ) {
        Authentication.login(email, password)
      };

      function registerErrorFn(data  ̶,̶ ̶s̶t̶a̶t̶u̶s̶,̶ ̶h̶e̶a̶d̶e̶r̶s̶,̶ ̶c̶o̶n̶f̶i̶g̶,) {
        console.log(data)
      }
    }

    function login(email, password){
      return $http.post('/api/v1/auth/login/', {
        email: email,
        password: password
      }).then(loginSuccessFn, loginErrorFn);

      function loginSuccessFn(data  ̶,̶ ̶s̶t̶a̶t̶u̶s̶,̶ ̶h̶e̶a̶d̶e̶r̶s̶,̶ ̶c̶o̶n̶f̶i̶g̶ ) {

        Authentication.setAuthenticatedAccount(data.data);
        // pass data through to dashboard controller
        window.location = '/dashboard'

        Authentication.currentUser += data.config.data.email
        console.log(Authentication.currentUser)

      }

      function loginErrorFn(data, status, headers, config) {
        console.error('Failed');
        console.log(data)
      }
}})();

dashboard.controller.js

//dashboard controller

(function() {
    'use strict';

    angular
      .module('thinkster.authentication.controllers')
      .controller('DashboardController', DashboardController);

    DashboardController.inject = ['$location, $scope', 'Authentication'];

    function DashboardController($location, $scope, Authentication){
        var vm = this;
        vm.user_info = user_info
        //vm.user_info2 = user_info

        function user_info() {
            return Authentication.currentUser
    }
    }

})();

I'm attempting to update currentUser in the loginSuccessFn(), it updates successfully in the service. I can see that in the console, but not when I try to reference it in my controller. Thanks in advance