Autofac throwing exception due to inaccessible constructor

[Ynoaparast]

Hi!

I'm trying to add some OpenTelemetry metrics (HttpClientInstrumentation) to my .NET 6 WebApi-project but I keep bumping into an exception:

Autofac.Core.Activators.Reflection.NoConstructorsFoundException: 'No accessible constructors were found for the type 'OpenTelemetry.Trace.TracerProvider'.'

The project which throws the exception is a multitarget .NET Framework & .NET standard 2.1 class library at this location:

cb.Register<IServiceProvider>(c =>
			{
				IComponentContext context = c.Resolve<IComponentContext>();
				return new FuncServiceProvider(type =>
					{
						if (typeof(ISchema).IsAssignableFrom(type))
						{
							throw new Exception(" ..... ");
						}
		HERE------->		return context.Resolve(type);
					});
			}).InstancePerLifetimeScope();

I noticed that the TracerProvider default constructor is protected. The current workaround for this is to explicitly register the TracerProvider in my WebApi-project using the 'Default' property which calls the constructor:

builder.Register<OpenTelemetry.Trace.TracerProvider>(x => TracerProvider.Default);

I'm not using the TracerProvider, but I assume it is a dependency somewhere down the line in the Metric code I'm using. I believe Autofac also scans my assemblies when registering types.

1. Is it intended that the constructor is protected?
2. Does anyone else use this along with Autofac who have experienced similar issue and perhaps solved it ?