Hi @ Tony Mu,
how to add room resource mailboxes to the room address list of specified OU
According to the guided steps in the official documentation, we can set the recipient filter conditions of the meeting room address list to custom parameters.
For example, create a room address list for the sales group OU, and set the recipient filter to CustomAttribute15 -eq 'Sales'.
New-AddressList -Name AL_Sales_Rooms -RecipientFilter " (CustomAttribute15 -eq 'Sales') -and (RecipientDisplayType -eq 'ConferenceRoomMailbox') -or (RecipientDisplayType -eq 'SyncedConferenceRoomMailbox')"
And set the CustomAttribute15 property of the room mailbox used for the sales group to 'Sales'.
Set-mailbox -identity “sale room” -CustomAttribute15 “Sales“
In addition, for detailed steps on deploying ABP, please refer to the detailed scenario in this link:
Scenario Deploying address book policies in Exchange Server | Microsoft Learn
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