Hello @AudioMike, and thanks for your report! We have a guide available here for connecting to your iTunes library, but can you show me the error you’re getting? Are you able to access this folder outside of Roon across your network?
So we can better assist you, please provide a brief description of your current setup using this link as a guide.
Make sure to describe your network configuration/topology, including any networking hardware currently in use, so we can have a clear understanding of how your devices are communicating.