You cannot add mailbox database copies in Exchange Server 2010

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Symptoms

You cannot add a mailbox database copy in Microsoft Exchange Server 2010.

When you try to add a mailbox database copy by using the Exchange Management Console, you receive an error message that resembles the following:

Exchange Management Shell command attempted:
Add-MailboxDatabaseCopy -Identity 'database_name' -MailboxServer 'server_name' -ActivationPreference 'preference'

When you try to add a mailbox database copy by using the Add_MailboxDatabaseCopy cmdlet in the Exchange Management Shell, you receive an error message that resembles the following:

WMI exception occurred on server 'server_name.domain_name.com': Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))

+ CategoryInfo : NotSpecified: (0:Int32) [Add-MailboxDatabaseCopy], WmiException
+ FullyQualifiedErrorId : 2FEA693E,Microsoft.Exchange.Management.SystemConfigurationTasks.AddMailboxDatabaseCopy

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Cause

This issue can occur if the Exchange Trusted Subsystem (ETS) universal security group is not a member of the Local Administrators group on one or more of the database availability group (DAG) servers.

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Resolution

To resolve this issue, add the ETS universal security group to the Local Administrators group on one or more of the DAG servers.

Note If this issue occurs again, check whether an existing Group Policy Object is changing the Local Administrators group.

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