Endpoint type 'Microsoft.Exchange.Monitoring.ActiveMonitoring.Common.MailboxDatabaseEndpoint' has not been initialized.

Hi,

We are currently getting the following errors in Applications and Services Logs > Microsoft > Exchange > ActiveMonitoring > MaintenanceResult:

Error
Endpoint type 'Microsoft.Exchange.Monitoring.ActiveMonitoring.Common.SubjectListEndpoint' has not been initialized. Make sure the endpoint is enabled in its definition, and that it has executed successfully.
 
Exception
Microsoft.Exchange.Monitoring.ActiveMonitoring.Local.EndpointManagerEndpointUninitializedException: Endpoint type 'Microsoft.Exchange.Monitoring.ActiveMonitoring.Common.SubjectListEndpoint' has not been initialized. Make sure the endpoint is enabled in its definition, and that it has executed successfully. at Microsoft.Exchange.Monitoring.ActiveMonitoring.Common.LocalEndpointManager.GetEndpoint(Type type, Boolean throwIfEndpointContainsException) at Microsoft.Exchange.Monitoring.ActiveMonitoring.Common.LocalEndpointManager.get_SubjectListEndpoint() at Microsoft.Exchange.Monitoring.ActiveMonitoring.ActiveMonitoring.ObserverMaintenance.DoWork(CancellationToken cancellationToken) at Microsoft.Office.Datacenter.WorkerTaskFramework.WorkItem.Execute(CancellationToken joinedToken) at Microsoft.Office.Datacenter.WorkerTaskFramework.WorkItem.<>c__DisplayClass2.<StartExecuting>b__0() at System.Threading.Tasks.Task.Execute()

and

Error
Endpoint type 'Microsoft.Exchange.Monitoring.ActiveMonitoring.Common.MailboxDatabaseEndpoint' has not been initialized. Make sure the endpoint is enabled in its definition, and that it has executed successfully.
 
Exception
Microsoft.Exchange.Monitoring.ActiveMonitoring.Local.EndpointManagerEndpointUninitializedException: Endpoint type 'Microsoft.Exchange.Monitoring.ActiveMonitoring.Common.MailboxDatabaseEndpoint' has not been initialized. Make sure the endpoint is enabled in its definition, and that it has executed successfully. at Microsoft.Exchange.Monitoring.ActiveMonitoring.Common.LocalEndpointManager.GetEndpoint(Type type, Boolean throwIfEndpointContainsException) at Microsoft.Exchange.Monitoring.ActiveMonitoring.Common.LocalEndpointManager.get_MailboxDatabaseEndpoint() at Microsoft.Exchange.Monitoring.ActiveMonitoring.Rps.RPSDiscovery.AddRPSBackEndLogonProbe() at Microsoft.Exchange.Monitoring.ActiveMonitoring.Rps.RPSDiscovery.DoWork(CancellationToken cancellationToken) at Microsoft.Office.Datacenter.WorkerTaskFramework.WorkItem.Execute(CancellationToken joinedToken) at Microsoft.Office.Datacenter.WorkerTaskFramework.WorkItem.<>c__DisplayClass2.<StartExecuting>b__0() at System.Threading.Tasks.Task.Execute()
 
Our Exchange 2013 CU9 doesn't seem to have any issues, but we still want to solve this problem. We have no idea where to go from here nor which MailboxDataBaseEndpoint it is "talking" about  (we have 19 Mailbox Databases). My Google Skills haven't returned any solutions or pointers either. Does any of you know where to go from here?

In forward thanks.