"Unknown Database" from app, however no problem with migrations from the command line

First off, I'm new to all this. I have never developed an app before. I had started last year and had a little bit of progress. I followed the tutorials here on Laracasts. I hit a road-block and stopped for several months. Somewhere in between my computer crashed, luckily I had my project folder saved on Dropbox.

I started up again this week with a fresh install of macOS, Homestead (via VirtualBox/Vargrant) composer, Laravel, MySQL server/workbench, etc. I edited the homestead.yaml file to point to my project's folder in Dropbox. When visited my app's URL (http://homestead.app) it loaded up just fine. I recreated the database and re-ran the migrations. All was well, my database schemas were just as they were when I was first working on this.

However, when I attempted to create a test user in my app, I received the following error: "PDOException in Connector.php line 55: SQLSTATE[HY000] [1049] Unknown database 'clat23_database"

The weird part is that the database migrations were successful when I ran "php artisan migrate".

What am I missing? Are there any special processes I need to perform to properly transition my project folder from my old install of my development environment to my new install?

Below you will find the code (that I believe) pertain to my issue, please let me know if any other part of my code will help diagnose this issue. Thanks!

.env:

APP_ENV=local
APP_DEBUG=true
APP_KEY=clat23_app_key
APP_URL=http://localhost

DB_CONNECTION=mysql
DB_HOST=127.0.0.1
DB_PORT=3306
DB_DATABASE=clat23_database
DB_USERNAME=clat23_username
DB_PASSWORD=clat23_password

CACHE_DRIVER=file
SESSION_DRIVER=file
QUEUE_DRIVER=sync

REDIS_HOST=127.0.0.1
REDIS_PASSWORD=null
REDIS_PORT=6379

MAIL_DRIVER=log
MAIL_HOST=mailtrap.io
MAIL_PORT=2525
MAIL_USERNAME=null
MAIL_PASSWORD=null
MAIL_ENCRYPTION=null

database.php:

<?php

return [

    /*
    |--------------------------------------------------------------------------
    | PDO Fetch Style
    |--------------------------------------------------------------------------
    |
    | By default, database results will be returned as instances of the PHP
    | stdClass object; however, you may desire to retrieve records in an
    | array format for simplicity. Here you can tweak the fetch style.
    |
    */

    'fetch' => PDO::FETCH_CLASS,

    /*
    |--------------------------------------------------------------------------
    | Default Database Connection Name
    |--------------------------------------------------------------------------
    |
    | Here you may specify which of the database connections below you wish
    | to use as your default connection for all database work. Of course
    | you may use many connections at once using the Database library.
    |
    */

    'default' => env('DB_CONNECTION', 'mysql'),

    /*
    |--------------------------------------------------------------------------
    | Database Connections
    |--------------------------------------------------------------------------
    |
    | Here are each of the database connections setup for your application.
    | Of course, examples of configuring each database platform that is
    | supported by Laravel is shown below to make development simple.
    |
    |
    | All database work in Laravel is done through the PHP PDO facilities
    | so make sure you have the driver for your particular database of
    | choice installed on your machine before you begin development.
    |
    */

    'connections' => [

        'sqlite' => [
            'driver' => 'sqlite',
            'database' => env('DB_DATABASE', database_path('database.sqlite')),
            'prefix' => '',
        ],

        'mysql' => [
            'driver' => 'mysql',
            'host' => env('DB_HOST', 'localhost'),
            'port' => env('DB_PORT', '3306'),
            'database' => env('DB_DATABASE', 'clat23_database'),
            'username' => env('DB_USERNAME', 'clat23_username'),
            'password' => env('DB_PASSWORD', 'clat23_password'),
            'charset' => 'utf8',
            'collation' => 'utf8_unicode_ci',
            'prefix' => '',
            'strict' => false,
            'engine' => null,
        ],

        'pgsql' => [
            'driver' => 'pgsql',
            'host' => env('DB_HOST', 'localhost'),
            'port' => env('DB_PORT', '5432'),
            'database' => env('DB_DATABASE', 'forge'),
            'username' => env('DB_USERNAME', 'forge'),
            'password' => env('DB_PASSWORD', ''),
            'charset' => 'utf8',
            'prefix' => '',
            'schema' => 'public',
        ],

    ],

    /*
    |--------------------------------------------------------------------------
    | Migration Repository Table
    |--------------------------------------------------------------------------
    |
    | This table keeps track of all the migrations that have already run for
    | your application. Using this information, we can determine which of
    | the migrations on disk haven't actually been run in the database.
    |
    */

    'migrations' => 'migrations',

    /*
    |--------------------------------------------------------------------------
    | Redis Databases
    |--------------------------------------------------------------------------
    |
    | Redis is an open source, fast, and advanced key-value store that also
    | provides a richer set of commands than a typical key-value systems
    | such as APC or Memcached. Laravel makes it easy to dig right in.
    |
    */

    'redis' => [

        'cluster' => false,

        'default' => [
            'host' => env('REDIS_HOST', 'localhost'),
            'password' => env('REDIS_PASSWORD', null),
            'port' => env('REDIS_PORT', 6379),
            'database' => 0,
        ],

    ],

];