Add-MailboxDatabaseCopy Index Out of Range

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I'm trying to add a database copy to my DAG but keep getting an error.  Any ideas?

[PS] C:\>Add-MailboxDatabaseCopy -identity ex-wsh1 -MailboxServer mb6 -ActivationPreference 3
Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
    + CategoryInfo          : NotSpecified: (0:Int32) [Add-MailboxDatabaseCopy], ArgumentOutOfRangeException
    + FullyQualifiedErrorId : 8654CC8D,Microsoft.Exchange.Management.SystemConfigurationTasks.AddMailboxDatabaseCopy
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I got it to work by changing the activation preference to 5.  Any idea why that would occur?

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