[Autodiscover] An internal server error occurred. The unhandled exception was: Microsoft.Exchange.Collections.TimeoutCache.DuplicateKeyException: Cannot add a duplicate key. Use Insert instead
at Microsoft.Exchange.Security.Authentication.FederatedAuthService.CacheReader.AddEntry(String userKey, Int32 userPolicy, ConfigWrapper config)
at Microsoft.Exchange.Security.Authentication.FederatedAuthService.BasicAuthPolicyRepo.GetUserPolicy(String userKey, Int32 traceId, Int32& userPolicy, HttpApplication httpApplication, IRecipientSession recipientSession, IConfigurationSession configSession, ConfigWrapper config)
at Microsoft.Exchange.Security.Authentication.FederatedAuthService.BasicAuthPolicyEvaluator.IsBasicAuthAllowed(String userKey, String protocolName, Int32 traceId, HttpApplication httpApplication, IRecipientSession recipientSession, IConfigurationSession configSession, ConfigWrapper config)
at Microsoft.Exchange.HttpProxy.ProxyModule.IsLegacyAuthAllowed(HttpApplication httpApplication)
at Microsoft.Exchange.HttpProxy.ProxyModule.OnPostAuthenticateInternal(HttpApplication httpApplication)
at Microsoft.Exchange.Common.IL.ILUtil.DoTryFilterCatch(Action tryDelegate, Func`2 filterDelegate, Action`1 catchDelegate)