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iTunes and Apple Music Help: Errors, Libraries and Device Syncing

Help with iTunes and Apple Music — error numbers during restores and downloads, library and syncing problems, Home Sharing and device connection issues.

Updated June 22, 2026

Media software occupies an awkward position: it manages large libraries, talks to online services, and on older setups also handles device restores. When something fails, the error can come from any of those layers.

This category covers download and playback errors, library problems, Home Sharing, and the device-syncing behaviour that moved from iTunes into Finder on modern macOS versions.

Several long-standing iTunes error numbers relate to device restores rather than music. Where that is the case, we point you to the restore guidance instead of treating it as a media problem.

Common troubleshooting pathways

Topic clusters

Error numbers

  • Restore-related errors
  • Download failures
  • Store connection errors
  • Authorisation problems
  • Unknown error numbers

Library and syncing

  • Missing tracks
  • Duplicate entries
  • Sync between devices
  • Local files versus streamed content
  • Storage use

Home Sharing and devices

  • Same-account requirements
  • Network visibility
  • Apple TV playback
  • Finder device syncing
  • Firewall considerations

Getting started

  • 1On modern macOS, device syncing happens in Finder rather than iTunes. Instructions written for older versions may not match your Mac.
  • 2Media errors that appear only on one network are usually connectivity problems, not library problems.
  • 3Signing out and back in resolves a surprising number of authorisation errors, and is reversible.
  • 4Content can disappear from a streaming catalogue for licensing reasons without anything being wrong with your library.

Frequently asked questions

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