Copy movies via Home Sharing does not work anymore - Error 5504
As describes here:
https://discussions.apple.com/thread/251192232
When I try to copy media from my Windows 10 iTunes to my macOS Catalina MBP I get the error "The selected files could not be copied from iTunes Library because an error occurred (5504)".
If I try to copy files from my MacBook to the Windows iTunes installation, iTunes on Windows bails out with "The selected files could not be copied from iTunes Library because this machine is not a member of the Home Sharing for the Apple ID 'my Apple ID'". And after this message Home Sharing got disabled.
I tried restarting all devices, disabled Home Sharing on all devices, wait and re-enable it. Signing out of iCloud and back in again does not help either.
Interesting though is that I'm able to stream the same files that fail above using Home Sharing. Just copying them from one machine to anther fails.
As everything worked perfectly a few days ago and I have not changed anything in my setup, I'm completely confused why this fails now. Anyone has an idea how to fix this?