Azure Active Directory Connection Problem Anbindung Office365 ans AD

Hallo zusammen,

ich versuche meine Office365 Umgebung mit meinem lokalen Active Directory zu synchronisieren.
Dafür verwende ich das Tool AADC.

Beim letzten Schritt kommt nach geraumer Zeit ein Fehler: An error occured execution Configure AAD Sync task: user_realm_discovery_failed: User realm discovery failed.

Folgendes steht im Log:

[08:33:06.593] [ 6] [ERROR] Creation of connector <Domain> - AAD failed. This may be due to replication delay. Retrying after 5 seconds ...
Exception Data (Raw): System.Management.Automation.CmdletInvocationException: user_realm_discovery_failed: User realm discovery failed ---> Microsoft.IdentityManagement.PowerShell.ObjectModel.SynchronizationConfigurationValidationException: user_realm_discovery_failed: User realm discovery failed
at Microsoft.DirectoryServices.MetadirectoryServices.UI.WebServices.MMSWebService.ValidateConfigurationParameters(Connector connector)
at Microsoft.DirectoryServices.MetadirectoryServices.UI.WebServices.MMSWebService.CreateConnector(Connector connector, Boolean validate)
at Microsoft.IdentityManagement.PowerShell.Cmdlet.AddADSyncConnectorCmdlet.ProcessRecord()
--- End of inner exception stack trace ---
at System.Management.Automation.Runspaces.PipelineBase.Invoke(IEnumerable input)
at System.Management.Automation.PowerShell.Worker.ConstructPipelineAndDoWork(Runspace rs, Boolean performSyncInvoke)
at System.Management.Automation.PowerShell.Worker.CreateRunspaceIfNeededAndDoWork(Runspace rsToUse, Boolean isSync)
at System.Management.Automation.PowerShell.CoreInvokeHelper[TInput,TOutput](PSDataCollection`1 input, PSDataCollection`1 output, PSInvocationSettings settings)
at System.Management.Automation.PowerShell.CoreInvoke[TInput,TOutput](PSDataCollection`1 input, PSDataCollection`1 output, PSInvocationSettings settings)
at System.Management.Automation.PowerShell.CoreInvoke[TOutput](IEnumerable input, PSDataCollection`1 output, PSInvocationSettings settings)
at Microsoft.Online.Deployment.PowerShell.LocalPowerShell.Invoke()
at Microsoft.Online.Deployment.PowerShell.PowerShellAdapter.TypeDependencies.InvokePowerShell(IPowerShell powerShell)
at Microsoft.Online.Deployment.PowerShell.PowerShellAdapter.InvokePowerShellCommand(String commandName, InitialSessionState initialSessionState, IDictionary`2 commandParameters, Boolean isScript)
at Microsoft.Azure.ActiveDirectory.Synchronization.PowerShellConfigAdapter.ConnectorConfigAdapter.AddConnector(Connector connector)
at Microsoft.Azure.ActiveDirectory.Synchronization.Config.ConnectorAdapterBase.CreateOrUpdateConnectorCore()
at Microsoft.Azure.ActiveDirectory.Synchronization.Framework.ActionExecutor.Execute(Action action, String description)
at Microsoft.Azure.ActiveDirectory.Synchronization.Config.ConnectorAdapterBase.CreateOrUpdateConnector(IEnumerable`1 objectClassInclusions, IEnumerable`1 attributeNameInclusions, ParameterKeyedCollection connectorGlobalParameters, Boolean createRunProfile)
at Microsoft.Online.Deployment.Types.Providers.SyncDataProvider.CreateConnectorWithRetry(ConnectorAdapterBase connectorAdapter, IEnumerable`1 objectClassInclusions, IEnumerable`1 attributeNameInclusions, ParameterKeyedCollection connectorGlobalParameters, Boolean createRunProfile)

Hatte jemand schonmal das Problem oder weiß wie ich dieses beheben kann?

Vielen Dank.