1) composer require msppack/outlook-calendar
2) Add service provider in config/app.php 
        MspPack\OutLookCalendar\OutLookCalendarServiceProvider::class,
3) php artisan vendor:publish
4) php artisan migrate

This will publish file called laravel-outlook-calendar.php in your config-directory with this contents:

<?php

return [

    // App's client ID. Register the app in Azure AD to get this value.
    'client_id' => '',

    // App's client secret. Register the app in Azure AD to get this value.
    'client_secret' => '',

    //Redirect url
    'redirect_url' => 'http://localhost:8000/admin/outlook-calendar/login',
];

Now go to ==> http://<YOUR DOMAIN>/admin/outlook-calendar