Error codes are meant for developers in the app creation phase. End users are supposed to see error notifications in descriptive text, when something goes wrong or when something invalid is tried.
We unfortunately have no list of mentioned codes.
Apple TV app user guide for Windows - Apple Support
You may need to Authorize (to a specific Apple Account) your computer for DRM’ed downloads from Apple.
How to authorize or deauthorize your Windows PC - Apple Support
… so I can download to get around the very irritating buffering issue.
Buffering may happen from insufficient bandwidth, or blocked hosts (firewalls, etc.), or inefficient network shaping software (alternate DNS, VPN, etc.). Please try deactivating such interfering options.
If you decide that you want to talk to Apple Support staff about your buffering issue, then contact them for further assistance. Contact Apple for support and service (phone numbers) or start your support request online (chat/email/callback).