Exchange 2016 Installation bricht bei Schritt 10 von 14 ab

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."  
          }
          }
        " ausgef¸hrt wurde: "Microsoft.Exchange.Data.DataValidationException: 'Database' ist f¸r 'UserMailbox' verbindlich.".  

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."  
          }
          }
        " ausgef¸hrt wurde: "Microsoft.Exchange.Data.DataValidationException: 'Database' ist f¸r 'UserMailbox' verbindlich.  
   bei Microsoft.Exchange.Configuration.Tasks.Task.ThrowError(Exception exception, ErrorCategory errorCategory, Object target, String helpUrl)
   bei Microsoft.Exchange.Configuration.Tasks.Task.WriteError(Exception exception, ErrorCategory category, Object target, Boolean reThrow)
   bei Microsoft.Exchange.Configuration.Tasks.DataAccessTask`1.Validate(TDataObject dataObject)
   bei Microsoft.Exchange.Configuration.Tasks.SetTaskBase`1.InternalValidate()
   bei Microsoft.Exchange.Configuration.Tasks.SetRecipientObjectTask`3.InternalValidate()
   bei Microsoft.Exchange.Management.Common.SetMailEnabledRecipientObjectTask`3.InternalValidate()
   bei Microsoft.Exchange.Management.RecipientTasks.SetUserBase`3.InternalValidate()
   bei Microsoft.Exchange.Management.RecipientTasks.SetMailboxBase`3.InternalValidate()
   bei Microsoft.Exchange.Management.RecipientTasks.SetMailbox.InternalValidate()
   bei Microsoft.Exchange.Configuration.Tasks.Task.<ProcessRecord>b__91_1()
   bei Microsoft.Exchange.Configuration.Tasks.Task.InvokeRetryableFunc(String funcName, Action func, Boolean terminatePipelineIfFailed)".