Symptoms
Consider the following scenario in a Microsoft Exchange Server 2016 environment:
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You have multiple domains (parent and child domains) in an Active Directory forest. An Exchange server is installed in one of those domains and users are located in a sibling domain of the domain where the Exchange server is installed.
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You notice that the RecipientViewRoot parameter in the Get-ADServerSettings cmdlet is set to the domain where the Exchange server is installed by default. This means that when you run the Get-Mailbox cmdlet, it will return mailboxes that are in that domain only.
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You change the recipient scope to sibling domains by using the RecipientViewRoot parameter.
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You run the Get-Mailbox cmdlet and expect to see the mailboxes of the sibling domains.
Unexpectedly, you see the mailboxes still from the domain where the Exchange server is installed.
Resolution
To fix this issue, install Cumulative Update 8 for Exchange Server 2016 or a later cumulative update for Exchange Server 2016.
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
References
Learn about the terminology that Microsoft uses to describe software updates.
