Released: June 2021 Quarterly Exchange Updates

Hi experienced the following error and resolved it by creating the missing container "Computers" on the domain root.

See this: https://support.microsoft.com/fr-fr/topic/-object-reference-not-set-to-an-instance-of-an-object-error-and-setup-fails-in-exchange-2019-cu10-and-2016-cu21-12b84c6c-5177-4ba4-a946-cd4f77e96cc7

H:\>Setup.exe /PrepareAD /IAcceptExchangeServerLicenseTerms

Microsoft Exchange Server 2019 Cumulative Update 10 Unattended Setup

Copying Files...
File copy complete. Setup will now collect additional information needed for installation.


Performing Microsoft Exchange Server Prerequisite Check

    Prerequisite Analysis                                                                                                                                                                                                  COMPLETED

Configuring Microsoft Exchange Server

    Organization Preparation                                                                                                                                                                                               FAILED

The following error was generated when "$error.Clear();
 $createTenantRoot = ($RoleIsDatacenter -or $RoleIsPartnerHosted);
 $createMsoSyncRoot = $RoleIsDatacenter;

 #$RoleDatacenterIsManagementForest is set only in Datacenter
deployment; interpret its absense as $false
 [bool]$isManagementForest = ($RoleDatacenterIsManagementForest -eq $true);

 if ($RolePrepareAllDomains)
 {
 initialize-DomainPermissions -AllDomains:$true -CreateTenantRoot:$createTenantRoot
-CreateMsoSyncRoot:$createMsoSyncRoot -IsManagementForest:$isManagementForest;
 }
 elseif ($RoleDomain -ne $null)
 {
 initialize-DomainPermissions -Domain $RoleDomain -CreateTenantRoot:$createTenantRoot
-CreateMsoSyncRoot:$createMsoSyncRoot -IsManagementForest:$isManagementForest;
 }
 else
 {
 initialize-DomainPermissions -CreateTenantRoot:$createTenantRoot -CreateMsoSyncRoot:$createMsoSyncRoot -IsManagementForest:$isManagementForest;

}
 " was run: "System.NullReferenceException: Object reference not set to an instance of an object.
 at Microsoft.Exchange.Management.Tasks.SetupTaskBase.LogReadObject(ADRawEntry obj)
 at
Microsoft.Exchange.Management.Tasks.InitializeDomainPermissions.InternalProcessRecord()
 at Microsoft.Exchange.Configuration.Tasks.Task.<ProcessRecord>b__91_1()
 at
Microsoft.Exchange.Configuration.Tasks.Task.InvokeRetryableFunc(String funcName, Action func, Boolean terminatePipelineIfFailed)
 at Microsoft.Exchange.Configuration.Tasks.Task.ProcessTaskStage(TaskStage taskStage, Action initFunc,
Action mainFunc, Action completeFunc)
 at Microsoft.Exchange.Configuration.Tasks.Task.ProcessRecord()
 at System.Management.Automation.CommandProcessor.ProcessRecord()".


The Exchange Server setup operation didn't complete. More details can be found in ExchangeSetup.log located in the <SystemDrive>:\ExchangeSetupLogs folder.