Hi,@Roger Roger
Thanks for posting your question in the Microsoft Q&A forum.
The command you provided is correct and can achieve the effect you expect.
You can also use loops to process each room.
$rooms = Import-Csv -Path "C:\temp\input.csv"
foreach ($room in $rooms) { Set-CalendarProcessing -Identity $room.EmailAddress -BookInPolicy "[user1@contoso.com](mailto:user1@contoso.com)","[user2@contoso.com](mailto:user2@contoso.com)"
-AllBookInPolicy $false -AddAdditionalResponse $true
-AdditionalResponse "This room is restricted." }
If my answer is helpful to you, please mark it as the answer so that other users can refer to it. Thank you for your support and understanding.