TokenMismatchException thrown when Echo attempts to subscribe to private channel

My setup:

• Laravel 5.4 with Auth
• Laravel Echo Server running on port 2096 due to Cloudflare's WebSocket port restrictions
• Redis 3.2.8

Directory and Laravel config:

I have Laravel in my home directory with the proper file permissions set. There's a symlink at /var/www/html/dash which points to ~/laravel/public. In Laravel's .env file, APP_URL is set to my domain with /dash trailing (correct me if this should simply be the domain).

Laravel Echo Server config:

• authEndpoint is set to /dash/broadcasting/auth
• authHost is https://{hostname}
• host is blank
• port is 2096
• protocol is https
• socketio is an empty array
• sslCertPath and sslKeyPath are set properly

Echo Client config:

• broadcaster is socket.io
• host is https://{hostname}:2096
• authEndpoint is /dash/broadcasting/auth

The Issue:

Whenever I log into the Laravel application, the view loads properly and socketio is properly loaded from https://{hostname}:2096/socket.io/socket.io.js, but for some odd reason the authentication does not work properly. Laravel echo server outputs 6W23Ffb2M02MM4O7AAAA could not be authenticated to private-user.1 as well as Client can not be authenticated, got HTTP status 500

Any help is wildly appreciated!