In simple terms Room List work as distribution groups for conference or other types of rooms.

#Connect to Office365 Import-Module MSOnline $O365Cred = Get-Credential $O365Session = New-PSSession –ConfigurationName Microsoft.Exchange -ConnectionUri https://ps.outlook.com/powershell -Credential $O365Cred -Authentication Basic -AllowRedirection Import-PSSession $O365Session
New-DistributionGroup -Name HQ -DisplayName "HQ" –PrimarySmtpAddress [email protected] –RoomList

Add-DistributionGroupMember –Identity "HQ" -Member [email protected]

Get-DistributionGroup | Where {$_.RecipientTypeDetails -eq "RoomList"} | Format-Table DisplayName,Identity,PrimarySmtpAddress
Get-DistributionGroupMember –Identity "HQ"]]>