Fehler bei der Installation von MS Exchange 2016 (Schritt 11 von 15: Postfachrolle: Postfachdienst)

Fehler:
Der folgende Fehler wurde generiert, als "$error.Clear();   
          if ($RoleIsDatacenter -ne $true -and $RoleIsDatacenterDedicated -ne $true)
          {
          if (Test-ExchangeServersWriteAccess -DomainController $RoleDomainController -ErrorAction SilentlyContinue)
          {
          $sysMbx = $null;
          $name = "SystemMailbox{bb558c35-97f1-4cb9-8ff7-d53741dc928c}";  
          $dispName = "Microsoft Exchange";  
          Write-ExchangeSetupLog -Info ("Retrieving mailboxes with Name=$name.");  
          $mbxs = @(Get-Mailbox -Arbitration -Filter {name -eq $name} -IgnoreDefaultScope -ResultSize 1 );
          if ($mbxs.Length -eq 0)
          {
          Write-ExchangeSetupLog -Info ("Retrieving mailbox databases on Server=$RoleFqdnOrName.");  
          $dbs = @(Get-MailboxDatabase -Server:$RoleFqdnOrName -DomainController $RoleDomainController);
          if ($dbs.Length -ne 0)
          {
          Write-ExchangeSetupLog -Info ("Retrieving users with Name=$name.");  
          $arbUsers = @(Get-User -Filter {name -eq $name} -IgnoreDefaultScope -ResultSize 1);
          if ($arbUsers.Length -ne 0)
          {
          Write-ExchangeSetupLog -Info ("Enabling mailbox $name.");  
          $sysMbx = Enable-Mailbox -Arbitration -Identity $arbUsers -DisplayName $dispName -database $dbs.Identity;
          }
          }
          }
          else
          {
          if ($mbxs.DisplayName -ne $dispName )
          {
          Write-ExchangeSetupLog -Info ("Setting DisplayName=$dispName.");  
          Set-Mailbox -Arbitration -Identity $mbxs -DisplayName $dispName -Force;
          }
          $sysMbx = $mbxs;
          }

          # Set the Organization Capabilities needed for this mailbox
          if ($sysMbx -ne $null)
          {
          # We need 1 GB for uploading large OAB files to the organization mailbox
          Write-ExchangeSetupLog -Info ("Setting mailbox properties.");  
          set-mailbox -Arbitration -identity $sysMbx -UMGrammar:$true -OABGen:$true -GMGen:$true -ClientExtensions:$true -MailRouting:$true -MessageTracking:$true -PstProvider:$true -MaxSendSize 1GB -Force;

          Write-ExchangeSetupLog -Info ("Configuring offline address book(s) for this mailbox");  
          Get-OfflineAddressBook | where {$_.ExchangeVersion.CompareTo([Microsoft.Exchange.Data.ExchangeObjectVersion]::Exchange2012) -ge 0 -and $_.GeneratingMailbox -eq $null} | Set-OfflineAddressBook -GeneratingMailbox $sysMbx.Identity;
          }
          else
          {
          Write-ExchangeSetupLog -Info ("Cannot find arbitration mailbox with name=$name.");  
          }
          }
          else
          {
          Write-ExchangeSetupLog -Info "Skipping creating E15 System Mailbox because of insufficient permission."  
          }
          }
        " ausgeführt wurde: "Microsoft.Exchange.Configuration.Tasks.ManagementObjectNotFoundException: Die Datenbank "Mailbox Database 2090569783" wurde nicht gefunden. Stellen Sie sicher, dass sie richtig eingegeben wurde.  
   bei Microsoft.Exchange.Configuration.Tasks.DataAccessTask`1.GetDataObject[TObject](IIdentityParameter id, IConfigDataProvider session, ObjectId rootID, OptionalIdentityData optionalData, Func`2 notFoundError, Func`2 multipleFoundError, ExchangeErrorCategory errorCategory)
   bei Microsoft.Exchange.Management.RecipientTasks.GetMailboxOrSyncMailbox`1.<>c__DisplayClass7.<SetDefaultRetentionValues>b__6()
   bei Microsoft.Exchange.Data.Directory.ProvisioningCache.ProvisioningCache.TryAddAndGetGlobalDictionaryValue[T,K](Guid key, K subKey, CacheObjectGetterDelegate getter)
   bei Microsoft.Exchange.Management.RecipientTasks.GetMailboxOrSyncMailbox`1.SetDefaultRetentionValues(Mailbox mailbox)
   bei Microsoft.Exchange.Management.RecipientTasks.GetMailboxOrSyncMailbox`1.ConvertDataObjectToPresentationObject(IConfigurable dataObject)
   bei Microsoft.Exchange.Management.RecipientTasks.GetMailbox.ConvertDataObjectToPresentationObject(IConfigurable dataObject)
   bei Microsoft.Exchange.Configuration.Tasks.GetRecipientObjectTask`2.WriteResult(IConfigurable dataObject)
   bei Microsoft.Exchange.Configuration.Tasks.GetTaskBase`1.WriteResult[T](IEnumerable`1 dataObjects)
   bei Microsoft.Exchange.Configuration.Tasks.GetTaskBase`1.InternalProcessRecord()
   bei Microsoft.Exchange.Configuration.Tasks.GetObjectWithIdentityTaskBase`2.InternalProcessRecord()
   bei Microsoft.Exchange.Configuration.Tasks.GetRecipientObjectTask`2.InternalProcessRecord()
   bei Microsoft.Exchange.Management.RecipientTasks.GetRecipientWithAddressListBase`2.InternalProcessRecord()
   bei Microsoft.Exchange.Configuration.Tasks.Task.<ProcessRecord>b__b()
   bei Microsoft.Exchange.Configuration.Tasks.Task.InvokeRetryableFunc(String funcName, Action func, Boolean terminatePipelineIfFailed)".