Azure Functions - Application Insights - Custom Telemetry - EventSource instance already exists

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I am trying to follow the instructions in Insights Preview where I can create custom telemetry. I followed the instructions exactly. But maybe I've got it configured wrong.

I have the APPINSIGHTS_INSTRUMENTATIONKEY set in the local.settings.json file and it seems to work fine. But when I add a new TelemetryClient I start getting those duplicate errors (below). It happens when the function gets invoked.

I really would like the telemetry data from AF to go to the same AI instrumentation key so I can see it together.

I also pulled the Microsoft.Extensions.Logging out as I wanted to use AI only, if that makes any difference.

Anyone have any suggestions?

See below...

TIA

ERROR: Exception in Command Processing for EventSource Microsoft-ApplicationInsights-Core: An instance of EventSource with Guid 74af9f20-af6a-5582-9382-f21f674fb271 already exists.
ERROR: Exception in Command Processing for EventSource Microsoft-ApplicationInsights-Core: An instance of EventSource with Guid 74af9f20-af6a-5582-9382-f21f674fb271 already exists.
Microsoft.WindowsAzure.ServiceRuntime Critical: 102 : Unexpcted Exception During Runtime Startup:
System.TypeInitializationException: The type initializer for '<Module>' threw an exception. ---> <CrtImplementationDetails>.ModuleLoadException: The C++ module failed to load while attempting to initialize the default appdomain.
 ---> System.Runtime.InteropServices.COMException: Invalid operation. (Exception from HRESULT: 0x80131022)
   at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
   at <CrtImplementationDetails>.GetDefaultDomain()
   at <CrtImplementationDetails>.DoCallBackInDefaultDomain(IntPtr function, Void* cookie)
   at <CrtImplementationDetails>.LanguageSupport.InitializeDefaultAppDomain(LanguageSupport* )
   at <CrtImplementationDetails>.LanguageSupport._Initialize(LanguageSupport* )
   at <CrtImplementationDetails>.LanguageSupport.Initialize(LanguageSupport* )
   --- End of inner exception stack trace ---
   at <CrtImplementationDetails>.LanguageSupport.Initialize(LanguageSupport* )
   at .cctor()
   --- End of inner exception stack trace ---
   at Microsoft.WindowsAzure.ServiceRuntime.RoleEnvironment.InitializeEnvironment()
   at Microsoft.WindowsAzure.ServiceRuntime.RoleEnvironment..cctor()
ERROR: Exception in Command Processing for EventSource Microsoft-ApplicationInsights-Data: An instance of EventSource with Guid a62adddb-6b4b-519d-7ba1-f983d81623e0 already exists.
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