Horizon jobs paused

Hey All,

We're using Forge and have two servers that both push jobs (for multiple queues) to a single ElastiCache (redis) endpoint. Server one is configured (config/horizon.php) to process specific queues, and server two is configured to process others. The horizon dashboard shows all of the machines, supervisors, queues, and jobs, but horizon just won't process them! They sit in the queue and never complete. If I look at the Recent Jobs tab in the horizon dashboard it shows the jobs in "paused" mode. I've tried different configurations, including using a unique redis prefix for each machine, and also using the same redis prefix for each, but with the same results. I've run horizon:terminate and restarted it after every code and config change. What is the proper configuration for horizon to be run on multiple servers all using the same redis db? My configs look like this:

SERVER 1

[
    'prefix' => 'horizon:',
    'environments' => [
        'production' => [
            'server1-supervisor-prod1' => [
                'connection' => 'redis',
                'queue => ['email'],
                'balance' => 'simple',
                'tries' => 1,
            ],
        ],
    ],
]

SERVER 2

[
    'prefix' => 'horizon:',
    'environments' => [
        'production' => [
            'server2-supervisor-prod1' => [
                'connection' => 'redis',
                'queue => ['default', 'foo', 'bar'],
                'balance' => 'auto',
                'minProcesses' => 5,
                'maxProcesses' => 30,
                'tries' => 3,
            ],
        ],
    ],
]

Any ideas or tips are greatly appreciated!