Check that Sync Library is turned on in Apple Music settings
Make sure you are signed in with the same Apple ID on all devices
Confirm you have an active Apple Music or iTunes Match subscription
Restart the Music app on your Mac
Restart your Mac
Update macOS to the latest version
Update the Music app if an update is available
Turn Sync Library off, wait a few minutes, then turn it back on
Check your internet connection
Verify the missing songs are still in your local Music library
Re-download songs that show as unavailable or cloud-based
Remove and re-add the missing songs to your library
Check whether the songs are matched, uploaded, or purchased
Make sure the file format is supported by Apple Music
Reauthorize your Mac for Apple ID media purchases
Sign out of Apple Music and sign back in
Check for hidden or filtered playlists and library views
Disable VPN or firewall temporarily
Ensure Date and Time are set automatically on your Mac
Reset Music app preferences if syncing still fails
Contact Apple Support if the songs still do not appear