Vapor config null

Hi guys, i try to use this package https://github.com/baopham/laravel-dynamodb within vapor. However i cant make this package work since the it set the AWS config in config file.

This is the config file from dynamodb.php

<?php

return [

    /*
    |--------------------------------------------------------------------------
    | Default DynamoDb Connection Name
    |--------------------------------------------------------------------------
    |
    | Here you may specify which of the DynamoDb connections below you wish
    | to use as your default connection for all DynamoDb work.
    */

    'default' => env('DYNAMODB_CONNECTION', 'aws'),

    /*
    |--------------------------------------------------------------------------
    | DynamoDb Connections
    |--------------------------------------------------------------------------
    |
    | Here are each of the DynamoDb connections setup for your application.
    |
    | Most of the connection's config will be fed directly to AwsClient
    | constructor http://docs.aws.amazon.com/aws-sdk-php/v3/api/class-Aws.AwsClient.html#___construct
    */

    'connections' => [
        'aws' => [
            'credentials' => [
                'key' => env('AWS_ACCESS_KEY_ID', ''),
                'secret' => env('AWS_SECRET_ACCESS_KEY', ''),
                // If using as an assumed IAM role, you can also use the `token` parameter
                'token' => env('AWS_SESSION_TOKEN', ''),
            ],
            'region' => env('AWS_REGION', 'eu-west-1'),
             // if true, it will use Laravel Log.
             // For advanced options, see http://docs.aws.amazon.com/aws-sdk-php/v3/guide/guide/configuration.html
            'debug' => env('DYNAMODB_DEBUG', false),
        ],
        'aws_iam_role' => [
            'region' => env('AWS_REGION', ''),
            'debug' => true,
        ],
        'local' => [
            'credentials' => [
                'key' => 'dynamodb_local',
                'secret' => 'secret',
            ],
            'region' => 'stub',
             // see http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Tools.DynamoDBLocal.html
            'endpoint' => env('DYNAMODB_LOCAL_ENDPOINT'),
            'debug' => true,
        ],
        'test' => [
            'credentials' => [
                'key' => 'dynamodb_local',
                'secret' => 'secret',
            ],
            'region' => 'test',
            'endpoint' => env('DYNAMODB_LOCAL_ENDPOINT'),
            'debug' => true,
        ],
    ],
];

When i run vapor tinker development --code="dump(config('dynamodb.connections.aws'))" The output is:

Output:
array:3 [
  "credentials" => array:3 [
    "key" => ""
    "secret" => ""
    "token" => ""
  ]
  "region" => "eu-west-1"
  "debug" => false
]

Seems it cannot get the aws key in config, it always return null. How do i make this to work?