This is a fix for anyone who can't get their iTunes channel to show up in Windows if, like me, you have your iTunes media in a non-standard location, such as D:\iTunes…. instead of the default C:\users\%username%\music\iTunes\iTunes
You simply need to delete the folders and files from the default location, it isn’t enough to enter the xml path in Plex channel settings. Deleting the default folders and files and entering the xml path does the trick!
I hope this helps anyone with the same issue :)