The target principal name is incorrect when accessing via IIS

I am receiving an error on the standalone web component when trying to access it.

• The site is installed and configured on IIS 7.5 per the instructions. 
• Identity Broker is a base install also following the instructions.  
• I can access the endpoints hosted on the Identity Broker server from the IIS server. 
• The website is on port 8200 and shares the server with SharePoint and MIM Service & Portal. 
• Identity Broker is on a separate server with just MIM Sync. 
• The server also uses .NET4.6 (only mentioned here as I had issues with SharePoint).
• I have tried enabling Anonymous Authentication over Windows Authentication and have also tried using the Identity Broker service account in the application pool. 
• I've disabled Custom Errors to view the error, but have attached  Event Log item with the stack trace. 

It appears to be an authentication error, but I can't for the life of me work out where in the scheme of things it's coming from.

Broker Web Error.evtx

Event code: 3005 
Event message: An unhandled exception has occurred. 
Event time: 14/08/2017 9:20:14 AM 
Event time (UTC): 13/08/2017 11:20:14 PM 
Event ID: 7a9e61eff31a4fedbcdbc46027dff770 
Event sequence: 2 
Event occurrence: 1 
Event detail code: 0 
 
Application information: 
    Application domain: /LM/W3SVC/3/ROOT-1-131471400119122652 
    Trust level: Full 
    Application Virtual Path: / 
    Application Path: C:\inetpub\wwwroot\UnifyIdentityBroker\Identity Broker\StandaloneWeb\ 
    Machine name: IAM-DEV1-MIM2 
 
Process information: 
    Process ID: 5584 
    Process name: w3wp.exe 
    Account name: IIS APPPOOL\UNIFYIdentityBroker 
 
Exception information: 
    Exception type: HttpException 
    Exception message: The HTTP request is unauthorized with client authentication scheme 'Negotiate'. The authentication header received from the server was 'Negotiate oXIwcKADCgEBomkEZ2BlBgkqhkiG9xIBAgIDAH5WMFSgAwIBBaEDAgEepBEYDzIwMTcwODEzMjMyMDE0WqUFAgMNka+mAwIBKakOGwxERVYuQ1NJUk8uQVWqGTAXoAMCAQGhEDAOGwxzYS11bmlmeS1pZGI='.
   at System.Web.HttpApplicationFactory.EnsureAppStartCalledForIntegratedMode(HttpContext context, HttpApplication app)
   at System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr appContext, HttpContext context, MethodInfo[] handlers)
   at System.Web.HttpApplication.InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr appContext, HttpContext context)
   at System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context)
   at System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext)
The HTTP request is unauthorized with client authentication scheme 'Negotiate'. The authentication header received from the server was 'Negotiate oXIwcKADCgEBomkEZ2BlBgkqhkiG9xIBAgIDAH5WMFSgAwIBBaEDAgEepBEYDzIwMTcwODEzMjMyMDE0WqUFAgMNka+mAwIBKakOGwxERVYuQ1NJUk8uQVWqGTAXoAMCAQGhEDAOGwxzYS11bmlmeS1pZGI='.
Server stack trace: 
   at System.ServiceModel.Channels.HttpChannelUtilities.ValidateAuthentication(HttpWebRequest request, HttpWebResponse response, WebException responseException, HttpChannelFactory`1 factory)
   at System.ServiceModel.Channels.HttpChannelUtilities.ValidateRequestReplyResponse(HttpWebRequest request, HttpWebResponse response, HttpChannelFactory`1 factory, WebException responseException, ChannelBinding channelBinding)
   at System.ServiceModel.Channels.HttpChannelFactory`1.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)
   at System.ServiceModel.Channels.RequestChannel.Request(Message message, TimeSpan timeout)
   at System.ServiceModel.Dispatcher.RequestChannelBinder.Request(Message message, TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
   at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)
Exception rethrown at [0]: 
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at Unify.Framework.IStandardPostEngineCollector.RequiredSystemTypes()
   at Unify.Product.IdentityBroker.IdentityServiceClient.RequiredSystemTypes()
   at Unify.Connect.Web.ProfiledIdentityServiceClient.RequiredSystemTypes()
   at Unify.Connect.Web.MvcApplication.Application_Start()
The remote server returned an error: (401) Unauthorized.
   at System.Net.HttpWebRequest.GetResponse()
   at System.ServiceModel.Channels.HttpChannelFactory`1.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)
The target principal name is incorrect
   at System.Net.NTAuthentication.GetOutgoingBlob(Byte[] incomingBlob, Boolean throwOnError, SecurityStatus& statusCode)
   at System.Net.NTAuthentication.GetOutgoingBlob(String incomingBlob)
   at System.Net.NegotiateClient.DoAuthenticate(String challenge, WebRequest webRequest, ICredentials credentials, Boolean preAuthenticate)
   at System.Net.NegotiateClient.Authenticate(String challenge, WebRequest webRequest, ICredentials credentials)
   at System.Net.AuthenticationManagerDefault.Authenticate(String challenge, WebRequest request, ICredentials credentials)
   at System.Net.AuthenticationState.AttemptAuthenticate(HttpWebRequest httpWebRequest, ICredentials authInfo)
   at System.Net.HttpWebRequest.CheckResubmitForAuth()
   at System.Net.HttpWebRequest.CheckResubmit(Exception& e, Boolean& disableUpload)
 
 
Request information: 
    Request URL: http://localhost:8200/ 
    Request path: / 
    User host address: ::1 
    User:  
    Is authenticated: False 
    Authentication Type:  
    Thread account name: IIS APPPOOL\UNIFYIdentityBroker 
 
Thread information: 
    Thread ID: 12 
    Thread account name: IIS APPPOOL\UNIFYIdentityBroker 
    Is impersonating: False 
    Stack trace:    at System.Web.HttpApplicationFactory.EnsureAppStartCalledForIntegratedMode(HttpContext context, HttpApplication app)
   at System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr appContext, HttpContext context, MethodInfo[] handlers)
   at System.Web.HttpApplication.InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr appContext, HttpContext context)
   at System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context)
   at System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext)
 
 
Custom event details: