Need help with registering appseting.json using DI

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.NET-Core

I am in .NETcore 3.0 and using a Nuget package created in .Net Framework 4.7.2

I wanted to something like this:

services.Configure<IAuthenticationConfig>(c => AuthenticationConfig.Create(Configuration.GetSection("authorisation").ToString()));

services.AddSingleton<IAuthenticationProcessor, AuthenticationProcessor>();

AuthenticationConfig Only accepts Web.config section but in .NET Core I am using appsetting.json and created the same section.

When I am starting to run the project I am getting an error like this:

An error occurred while starting the application.
AggregateException: Some services are not able to be constructed (Error while validating the service descriptor 'ServiceType: RAPP.Authentication.OpenID.IAuthenticationProcessor Lifetime: Singleton ImplementationType: RAPP.Authentication.OpenID.AuthenticationProcessor': Unable to resolve service for type 'RAPP.Authentication.OpenID.Managers.IAuthenticationManagerFactory' while attempting to activate 'RAPP.Authentication.OpenID.AuthenticationProcessor'.)
Microsoft.Extensions.DependencyInjection.ServiceProvider..ctor(IEnumerable<ServiceDescriptor> serviceDescriptors, ServiceProviderOptions options)

InvalidOperationException: Error while validating the service descriptor 'ServiceType: RAPP.Authentication.OpenID.IAuthenticationProcessor Lifetime: Singleton ImplementationType: RAPP.Authentication.OpenID.AuthenticationProcessor': Unable to resolve service for type 'RAPP.Authentication.OpenID.Managers.IAuthenticationManagerFactory' while attempting to activate 'RAPP.Authentication.OpenID.AuthenticationProcessor'.
Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngine.ValidateService(ServiceDescriptor descriptor)

AggregateException: Some services are not able to be constructed (Error while validating the service descriptor 'ServiceType: RAPP.Authentication.OpenID.IAuthenticationProcessor Lifetime: Singleton ImplementationType: RAPP.Authentication.OpenID.AuthenticationProcessor': Unable to resolve service for type 'RAPP.Authentication.OpenID.Managers.IAuthenticationManagerFactory' while attempting to activate 'RAPP.Authentication.OpenID.AuthenticationProcessor'.)
Microsoft.Extensions.DependencyInjection.ServiceProvider..ctor(IEnumerable<ServiceDescriptor> serviceDescriptors, ServiceProviderOptions options)
Microsoft.Extensions.DependencyInjection.ServiceCollectionContainerBuilderExtensions.BuildServiceProvider(IServiceCollection services, ServiceProviderOptions options)
Microsoft.Extensions.DependencyInjection.DefaultServiceProviderFactory.CreateServiceProvider(IServiceCollection containerBuilder)
Microsoft.Extensions.Hosting.Internal.ServiceFactoryAdapter<TContainerBuilder>.CreateServiceProvider(object containerBuilder)
Microsoft.Extensions.Hosting.HostBuilder.CreateServiceProvider()
Microsoft.Extensions.Hosting.HostBuilder.Build()
Gas_Gateway.Program.Main(string[] args) in Program.cs
+ 
namespace Gas_Gateway
                                                    {
                                                        public class Program
                                                        {
                                                            public static void Main(string[] args)
                                                            {
                                                        CreateHostBuilder(args).Build().Run();
                                                }
                                                    
                                                            public static IHostBuilder CreateHostBuilder(string[] args) =>
                                                                Host.CreateDefaultBuilder(args)
                                                                    .ConfigureWebHostDefaults(webBuilder =>
                                                                    {

If someone please let me know how Can I initialize the appsetting.json in this scenario that would be great.

Thank you in advance

What I have tried:

not sure what to do in this case