Queue configuration on Forge, redis not configured

I've got a site working fine locally and am attempting to get it functioning on Forge. Specifically accessing Horizon. When I try to do this, I am receiving a 403 Forbidden response.

Initially, focusing on this I set the gate in HorizonServiceProvider.php to be:

protected function gate()
{
    Gate::define('viewHorizon', function ($user) {
        // return $user->isAdmin();
        return true;
    });
}

However, this didn't resolve the issue and I have since begun to think my issue stems from queue configuration. Certainly user error...

The specific error I have most recently encountered is:

php: [2019-08-17 20:25:45] production.ERROR: Redis connection [redis] not configured. {"exception":"[object] (InvalidArgumentException(code: 0): Redis connection [redis] not configured. at /home/forge/site/vendor/laravel/framework/src/Illuminate/Redis/RedisManager.php:116)

These are the settings I am using in my project and are being deployed to Forge:

config/queue.php

'connections' => [
    'redis' => [
        'driver' => 'redis',
        'connection' => 'redis',
        'queue' => env('REDIS_QUEUE', 'default'),
        'retry_after' => 90,
        'block_for' => 5,
    ],
];

config/horizon.php

'environments' => [
    'production' => [
        'supervisor-1' => [
            'connection' => 'redis',
            'queue' => ['default', 'slow'],
            'balance' => 'auto',
            'processes' => 10,
            'tries' => 3,
        ],
    ],

    'local' => [
        'supervisor-1' => [
            'connection' => 'redis',
            'queue' => ['default', 'slow'],
            'balance' => 'auto',
            'processes' => 3,
            'tries' => 3,
        ],
    ],
],

.env

APP_NAME=site
APP_ENV=production
APP_KEY=base64:
APP_DEBUG=false
APP_LOG_LEVEL=debug
APP_URL=https://site

DB_CONNECTION=mysql
DB_HOST=127.0.0.1
DB_PORT=3306
DB_DATABASE=forge
DB_USERNAME=forge
DB_PASSWORD=pass

BROADCAST_DRIVER=pusher
CACHE_DRIVER=redis
SESSION_DRIVER=file
QUEUE_CONNECTION=redis

REDIS_HOST=127.0.0.1
REDIS_PASSWORD=null
REDIS_PORT=6379

Forge Queue settings

https://imgur.com/LVVMd8O

Final point, before arriving at the above configuration I was getting a different error. Not sure if this will be of use or if some clarification on how this relates to the connection/driver/queue settings.

No connector for [] exception":"[object] (InvalidArgumentException(code: 0): No connector for [] at laravel/framework/src/Illuminate/Queue/QueueManager.php:172)

Thank you!