If you click Details or view the log file, you see the following error:
Client configuration failed with the exception : The HTTP request is unauthorized with client authentication scheme 'Anonymous'. The authentication header received from the server was 'Bearer authorization_uri=https://login.windows.net/common/oauth2/authorize'.
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 Microsoft.Xrm.Sdk.Discovery.IDiscoveryService.Execute(DiscoveryRequest request)
at Microsoft.Xrm.Sdk.WebServiceClient.DiscoveryWebProxyClient.<>c__DisplayClass1.<ExecuteCore>b__0()
at Microsoft.Xrm.Sdk.WebServiceClient.WebProxyClient`1.ExecuteAction[TResult](Func`1 action)
at Microsoft.Xrm.Sdk.WebServiceClient.DiscoveryWebProxyClient.ExecuteCore(DiscoveryRequest request)
at Microsoft.Xrm.Sdk.WebServiceClient.DiscoveryWebProxyClient.Execute(DiscoveryRequest request)
at Microsoft.Crm.Application.Outlook.Config.DeploymentsInfo`1.DeploymentInfo`1.RequestOrganizationDetailsFromDiscovery(IDiscoveryService proxy, EndpointAccessType endpointAccessType)
at Microsoft.Crm.Application.Outlook.Config.DeploymentsInfo`1.DeploymentInfo`1.LoadOrganizationsInternal(AuthUIMode uiMode, Control parentWindow)
at Microsoft.Crm.Application.Outlook.Config.DeploymentsInfo`1.DeploymentInfo`1.LoadFederatedOrganizations(AuthUIMode uiMode, Control parentWindow)
at Microsoft.Crm.Application.Outlook.Config.DeploymentsInfo`1.LoadFederatedOrgs(DataCollection`1 orgs)
at Microsoft.Crm.Application.Outlook.Config.DeploymentsInfo`1.LoadOrganizations(AuthUIMode uiMode, Control parentWindow)
at Microsoft.Crm.Application.Outlook.Config.ClientConfig.AddDeployment(DeploymentsDeployment[] deployments, AuthUIMode uiMode)
at Microsoft.Crm.Application.Outlook.Config.ClientConfig.AddDeployment_ReducedUI()
at Microsoft.Crm.Application.Outlook.Config.ClientConfig.Run(Boolean runInsideOutlook)