The recipient scope setting doesn't work for sibling domains when including OUs in the scope in Exchange Server 2019 and 2016

Symptoms

Consider the following scenario in a Microsoft Exchange Server 2019 or Exchange Server 2016 environment:

  • You have multiple domains (parent and child domains) in an Active Directory forest. An Exchange server is installed in one of those domains. Users are separately located in a sibling domain of the domain where the Exchange server is installed.

  • 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.

  • You change the recipient scope to sibling domains by using the RecipientViewRoot parameter.

  • 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.

Note There is a similar issue The recipient scope setting doesn't work for sibling domains in Exchange Server 2016 that was fixed in Cumulative Update 8 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.

Resolution

To fix this issue, install one of the following updates:For Exchange Server 2019, install the Cumulative Update 1 for Exchange Server 2019 or a later cumulative update for Exchange Server 2019.

For Exchange Server 2016, install the Cumulative Update 12 for Exchange Server 2016 or  a later cumulative update for Exchange Server 2016.

References

Learn about the  terminology that Microsoft uses to describe software updates.

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