How to setup a Room List in Microsoft Exchange Server Systems

If you want to connect with your Microsoft Exchange EWS Endpoint by using a Service Account to read all Room Mailboxes you have to setup a Room List (Distribution Group from Type RoomList) via Exchange Shell.

New-DistributionGroup -Name RoomList01 -DisplayName "Building 1 Conference Rooms" –PrimarySmtpAddress –RoomList -ManagedBy

After you create the RoomList you have to add the Rooms to the list.

Add-DistributionGroupMember –Identity Room01 -Member

If you want to check the configuration of your RoomList you can use

Get-DistributionGroup -Identity Room01 | FL

If you need further information please check the Microsoft Docs