It is possible to extract/export room list of all of the endpoints that are in the Synergy JOIN application using the below powershell script.
The Script will have to be run on the server that is running Synergy JOIN.
Requirements for the script:
Windows Server has to be running PowerShell v5.1 minimum
Get-Content C:\SynergySky\SynergySKYEnterpriseScheduling\Config\config.json | ConvertFrom-Json | select -expand endpoints | select ExchangeAlias,SystemIPAddress,ExchangeName | Out-File C:\SynergySKY\SynergySKYEnterpriseScheduling\Config\RoomOutput.txt
Once you have run the script, in the same folder you find the config.json file, there will be a text file called 'RoomOutput.txt'