If you have multiple rooms in your Exchange Online environment you want to use roomlist(s).
To create a roomlist first connect to powershell:
To create a roomlist enter the below command:
New-DistributionGroup -Name “New RoomList” -Roomlist
You will now have a roomlist, but the list is empty. To add room’s to the list enter the following command:
Add-DistributionGroupMember -Identity “New RoomList” -Member “Room 1”
You will need to enter the above command for each room you want to add to the list.