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There are a lot of articles about the 'invalid_grant' error but I didn't find an answer on my situation.

At first, with Postman I am able to get an access token from /token.svc and use it successfully on the discovery service (with the cduser account).

When I run the .NET webapplication (using the DD4T.Providers.DxaModelService package)I get the following error:

[DataServiceClientException: {"error":"invalid_grant"}]

   Microsoft.OData.Client.QueryResult.ExecuteQuery() +478

   Microsoft.OData.Client.DataServiceRequest.Execute(DataServiceContext context, QueryComponents queryComponents) +254



[DataServiceQueryException: An error occurred while processing this request.]

   Microsoft.OData.Client.DataServiceRequest.Execute(DataServiceContext context, QueryComponents queryComponents) +628

   Microsoft.OData.Client.DataServiceQuery`1.GetEnumerator() +22

   System.Linq.Enumerable.FirstOrDefault(IEnumerable`1 source) +220

   Microsoft.OData.Client.DataServiceQueryProvider.ReturnSingleton(Expression expression) +530

   Sdl.Web.ModelService.ModelServiceClient.GetModelServiceUri(String uri) +146

   Sdl.Web.ModelService.ModelServiceClient..ctor() +126

   DD4T.Providers.DxaModelService.BaseProvider..ctor(IProvidersCommonServices providersCommonServices) +137

   lambda_method(Closure , Object ) +104

   Autofac.Core.Activators.Reflection.ConstructorParameterBinding.Instantiate() +270



[DependencyResolutionException: An exception was thrown while invoking the constructor 'Void .ctor(DD4T.ContentModel.Contracts.Providers.IProvidersCommonServices)' on type 'TridionPageProvider'. ---> An error occurred while processing this request. (See inner exception for details.)]

   Autofac.Core.Activators.Reflection.ConstructorParameterBinding.Instantiate() +814

   Autofac.Core.Activators.Reflection.ReflectionActivator.ActivateInstance(IComponentContext context, IEnumerable`1 parameters) +269

   Autofac.Core.Resolving.InstanceLookup.Activate(IEnumerable`1 parameters) +110



[DependencyResolutionException: An error occurred during the activation of a particular registration. See the inner exception for details. Registration: Activator = TridionPageProvider (ReflectionActivator), Services = [DD4T.ContentModel.Contracts.Providers.IPageProvider], Lifetime = Autofac.Core.Lifetime.CurrentScopeLifetime, Sharing = None, Ownership = OwnedByLifetimeScope ---> An exception was thrown while invoking the constructor 'Void .ctor(DD4T.ContentModel.Contracts.Providers.IProvidersCommonServices)' on type 'TridionPageProvider'. ---> An error occurred while processing this request. (See inner exception for details.) (See inner exception for details.)]

   Autofac.Core.Resolving.InstanceLookup.Activate(IEnumerable`1 parameters) +433

   Autofac.Core.Resolving.InstanceLookup.Execute() +180

   Autofac.Core.Resolving.ResolveOperation.GetOrCreateInstance(ISharingLifetimeScope currentOperationScope, IComponentRegistration registration, IEnumerable`1 parameters) +171

   Autofac.Core.Activators.Reflection.ConstructorParameterBinding.Instantiate() +119

   Autofac.Core.Activators.Reflection.ReflectionActivator.ActivateInstance(IComponentContext context, IEnumerable`1 parameters) +269

   Autofac.Core.Resolving.InstanceLookup.Activate(IEnumerable`1 parameters) +110



[DependencyResolutionException: An error occurred during the activation of a particular registration. See the inner exception for details. Registration: Activator = PageFactory (ReflectionActivator), Services = [DD4T.ContentModel.Factories.IPageFactory], Lifetime = Autofac.Core.Lifetime.CurrentScopeLifetime, Sharing = Shared, Ownership = OwnedByLifetimeScope ---> An error occurred during the activation of a particular registration. See the inner exception for details. Registration: Activator = TridionPageProvider (ReflectionActivator), Services = [DD4T.ContentModel.Contracts.Providers.IPageProvider], Lifetime = Autofac.Core.Lifetime.CurrentScopeLifetime, Sharing = None, Ownership = OwnedByLifetimeScope ---> An exception was thrown while invoking the constructor 'Void .ctor(DD4T.ContentModel.Contracts.Providers.IProvidersCommonServices)' on type 'TridionPageProvider'. ---> An error occurred while processing this request. (See inner exception for details.) (See inner exception for details.) (See inner exception for details.)]

   Autofac.Core.Resolving.InstanceLookup.Activate(IEnumerable`1 parameters) +433

   Autofac.Core.Lifetime.LifetimeScope.GetOrCreateAndShare(Guid id, Func`1 creator) +155

   Autofac.Core.Resolving.InstanceLookup.Execute() +166

   Autofac.Core.Resolving.ResolveOperation.GetOrCreateInstance(ISharingLifetimeScope currentOperationScope, IComponentRegistration registration, IEnumerable`1 parameters) +171

   Autofac.Core.Activators.Reflection.ConstructorParameterBinding.Instantiate() +119

   Autofac.Core.Activators.Reflection.ReflectionActivator.ActivateInstance(IComponentContext context, IEnumerable`1 parameters) +269

   Autofac.Core.Resolving.InstanceLookup.Activate(IEnumerable`1 parameters) +110



[DependencyResolutionException: An error occurred during the activation of a particular registration. See the inner exception for details. Registration: Activator = PageController (ReflectionActivator), Services = [MijnPostNL.Controllers.PageController], Lifetime = Autofac.Core.Lifetime.CurrentScopeLifetime, Sharing = None, Ownership = OwnedByLifetimeScope ---> An error occurred during the activation of a particular registration. See the inner exception for details. Registration: Activator = PageFactory (ReflectionActivator), Services = [DD4T.ContentModel.Factories.IPageFactory], Lifetime = Autofac.Core.Lifetime.CurrentScopeLifetime, Sharing = Shared, Ownership = OwnedByLifetimeScope ---> An error occurred during the activation of a particular registration. See the inner exception for details. Registration: Activator = TridionPageProvider (ReflectionActivator), Services = [DD4T.ContentModel.Contracts.Providers.IPageProvider], Lifetime = Autofac.Core.Lifetime.CurrentScopeLifetime, Sharing = None, Ownership = OwnedByLifetimeScope ---> An exception was thrown while invoking the constructor 'Void .ctor(DD4T.ContentModel.Contracts.Providers.IProvidersCommonServices)' on type 'TridionPageProvider'. ---> An error occurred while processing this request. (See inner exception for details.) (See inner exception for details.) (See inner exception for details.) (See inner exception for details.)]

   Autofac.Core.Resolving.InstanceLookup.Activate(IEnumerable`1 parameters) +433

   Autofac.Core.Resolving.InstanceLookup.Execute() +180

   Autofac.Core.Resolving.ResolveOperation.GetOrCreateInstance(ISharingLifetimeScope currentOperationScope, IComponentRegistration registration, IEnumerable`1 parameters) +171

   Autofac.Core.Resolving.ResolveOperation.Execute(IComponentRegistration registration, IEnumerable`1 parameters) +108

   Autofac.ResolutionExtensions.TryResolveService(IComponentContext context, Service service, IEnumerable`1 parameters, Object& instance) +122

   Autofac.ResolutionExtensions.ResolveOptionalService(IComponentContext context, Service service, IEnumerable`1 parameters) +70

   Autofac.Integration.Mvc.AutofacDependencyResolver.GetService(Type serviceType) +95

   System.Web.Mvc.DefaultControllerActivator.Create(RequestContext requestContext, Type controllerType) +61



[InvalidOperationException: An error occurred when trying to create a controller of type 'MijnPostNL.Controllers.PageController'. Make sure that the controller has a parameterless public constructor.]

   System.Web.Mvc.DefaultControllerActivator.Create(RequestContext requestContext, Type controllerType) +242

   System.Web.Mvc.DefaultControllerFactory.CreateController(RequestContext requestContext, String controllerName) +103

   System.Web.Mvc.MvcHandler.ProcessRequestInit(HttpContextBase httpContext, IController& controller, IControllerFactory& factory) +263

   System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, Object state) +77

   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +1122

   System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +213

   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +131

My web.config has the following configuration:

<!-- Configuration of the Discovery Service -->

<add key="discovery-service-uri" value="http://<domain>/discovery.svc" />

<add key="oauth-enabled" value="true" />

<add key="oauth-client-id" value="cduser" />

<add key="oauth-client-secret" value="CDUserP@ssw0rd" />

Do you have any suggestions on how to fix this error?

Update: I had a look at Fiddler and there is no token being requested:

Using Fiddler I found out that the TokenService was registered on the localhost domain. That's why the webapplication (which was running on my local machine) couldn't access the TokenService on the development server.

See screenshot below:

I configured the TokenService with a domainname and now it works.