Upgrade to Autofac 4.0.0 for MultiplayGameFramework (more docs can be found at: https://docs.autofac.org/en/latest/configuration/xml.html)

Autofac4upgrade.cs

// Nuget Packages
//  Autofac 4.0.0
//  Autofac.Configuration v4.0.0
//  Microsoft.Extensions.Configuration.Json v1.0.0
//    Microsoft.Extensions.Configuration
//    Microsoft.Extensions.Configuration.FileExtensions
//    Microsoft.Extensions.Configuration.Abstractions

// Need to create a ConfigBuilder from Microsoft.Extensions.Configuration
// This code replaces the current Autofac code in PhotonApplication.cs in Setup()
var config = new ConfigurationBuilder();
// Add the file, similar to before, but to configBuilder
config.AddJsonFile(Path.Combine(BinaryPath, ApplicationName + ".json"));

// Build the configuration, this is from Autofac.Configurations.ConfigurationModule
var module = new ConfigurationModule(config.Build());

// Create Autofac container
var builder = new ContainerBuilder();
builder.RegisterInstance(this).SingleInstance();
builder.RegisterInstance(Log).As<ILogger>().SingleInstance();
// RegisterModule knows how to handle the config that was built
builder.RegisterModule(module);

// Build as usual
var container = builder.Build();

server.json

{
  "components": [
    {
      "type": "MultiplayerGameFramework.Implementation.Config.ServerConfiguration, MultiplayerGameFramework",
      "parameters": {
        "allowPhysicalClients": true,
        "parentPort": 4530,
        "siblingPort": 0,
        "subCodeParameterCode": 0,
        "peerIdCode": 1
      }
    }
  ],
  "modules": [
    {
      "type": "MGF_Photon.Modules.ProxyServerModule, MGF-Photon"
    }
  ]
}