Add-Adpermission for Exchange 2010 & BES5Express

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I'm installing BES5 Express in an environment with an Exchange 2010 server.

The installation instructions for Blackberry Enterprise Server 5 Express located here ( show to run this command: "Add-ADPermission -InheritedObjectType User -InheritanceType Descendents -ExtendedRights Send-As -User "BESAdmin" -Identity "DC=<domain_1>,DC=<domain_2>,DC=<domain_3>" where <domain_1>, <domain_2>, and <domain_3> form the name of the domain.

For example, if the domain name is, type example for <domain_1>, organization for <domain_2>, and net for <domain_3>.

I'm getting an error when I run what i think I'm supposed to put for this command.  Can someone tell me what it is i'm supposed to put and where I may be going wrong?

[PS] C:\>Add-ADPermission -InheritedObjectType User -InheritanceType Descendents -ExtendedRights Send-As -User "BESAdmin" -Identity "DC=cp,DC=local"
Creating a new session for implicit remoting of "Add-ADPermission" command...
Received a referral to local when requesting DC=local from dcserver1.cp.local.
 You have specified the wrong server for this operation.
    + CategoryInfo          : NotSpecified: (0:Int32) [Add-ADPermission], ADRe
    + FullyQualifiedErrorId : 9AAC9BE,Microsoft.Exchange.Management.RecipientT

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