Why can’t I turn on Sync library for Apple Music?

Apple Music’s Sync Library feature allows you to access your personal music library across all your devices. However, sometimes this feature doesn’t work as expected and you may find yourself unable to turn on Sync Library. There are a few potential reasons why you may be running into this problem.

Your Apple ID or iCloud Settings

One of the most common reasons that Sync Library may not be working is an issue with your Apple ID or iCloud settings. Here are a few things to check:

  • Make sure you are signed in to the same Apple ID on all your devices. Sync Library relies on having the same account active across all devices.
  • Check that iCloud Music Library is enabled on all devices. This can be found in Settings > Music on iOS devices and System Preferences > Music on Mac.
  • Ensure you have enough available iCloud storage to support Sync Library. You may need to purchase additional storage if your library is large.
  • Confirm that you are connected to the internet and signed in to iCloud on all devices. Syncing requires an active internet connection.

If your Apple ID or iCloud settings are misconfigured in any way, it can prevent Sync Library from working properly. Make sure everything is set up correctly across all your devices.

Restrictions and Parental Controls

On iOS devices and Macs used by children, parental restrictions may block the ability to enable Sync Library. Check the device restrictions under Settings > Screen Time > Content & Privacy Restrictions on iOS or System Preferences > Parental Controls on Mac. Make sure there are no restrictions enabled that prevent access to Apple Music or iCloud.

Unsupported Music Files

Your personal library may contains music files that are not supported by Sync Library and Apple Music. This includes music purchased from other services, downloaded files, or files with DRM protection. Here are some file types that may cause issues:

  • WMA files
  • FLAC files
  • AIFF files
  • WAV files
  • ALAC files
  • AAC files purchased from other services
  • MP3 files with DRM protection

You may need to exclude these file types from your library in order to enable Sync. Alternatively, you can convert them to MP3 or AAC format. Just be aware of any copyright restrictions.

Large Music Libraries

If your personal music library contains a very large number of songs, this can sometimes cause issues with turning on Sync Library. Apple Music has limits on library sizes for synced music. If your library exceeds 100,000 songs, you may encounter errors trying to activate the feature.

To fix this, you may need to reduce the size of your synced library by removing files. Focus on trimming redundant or low-quality files first. You can also use optimized versions of your files, such as 256kbps AAC files instead of lossless ALAC files, to reduce the size.

Corrupt Data

In some cases, corrupted data in your local music library can prevent Sync Library from activating properly. Indications of corruption may include missing album artwork, missing metadata like song titles, or files that skip unexpectedly when played.

To address this, you may need to delete your local music library and allow Apple Music to re-upload it fresh. On an iOS device, you can go to Settings > General > iPhone/iPad Storage > Music and delete all content. On Mac, delete the Music folder in Finder and any iTunes library files. Then re-enable Sync Library.

Upgrading your Operating System

Sometimes an Apple OS update can cause temporary issues with Sync Library until you update your devices. Make sure all your devices are upgraded to the latest OS versions available. This includes iOS/iPadOS 16.1 or later for mobile devices and macOS Ventura or later for Macs.

On old OS versions, you may encounter errors trying to turn on Sync Library. Keeping your devices updated ensures the best compatibility.

Logout and Reauthenticate Apple Music

In a small number of cases, logging out of Apple Music and iCloud on your devices and then logging back in can resolve problems activating Sync Library. This resets Apple Music and prompts it to re-check your libraries.

To sign out, go to Settings > Your Name > Media & Purchases and tap Sign Out. Sign back in with your Apple ID and password. Then try turning on Sync Library again. This forces your libraries to resync from scratch.

Contact Apple Support

If you still cannot get Sync Library working after trying the above solutions, you may need to contact Apple Support directly. Provide as much detail as possible about your setup. The Apple Support team can further troubleshoot and identify any problems that may be preventing Sync Library from working properly in your environment.

Frequently Asked Questions

Why does Sync Library keep turning itself off?

If Sync Library intermittently disables itself, this is likely due to an iCloud storage, network connectivity, or Apple ID issue. Check that you have sufficient iCloud storage, consistently strong internet access, and the same Apple ID signed in across devices.

Do all my devices need to have Sync Library turned on?

Yes, Sync Library needs to be enabled on all devices in order to work properly. Make sure it is toggled on under Music settings on each device.

What music formats are supported?

Sync Library supports MP3, AAC, ALAC, and most iTunes Plus files. Other formats like WMA, FLAC, AIFF, and WAV are not supported.

What is the limit on library size?

Apple Music allows libraries up to 100,000 songs to be synced. If your library exceeds this, you may need to remove files to get below the limit.

How long does it take to sync my library?

The initial library sync may take hours if you have a large amount of music to upload. Subsequent syncs are much faster. Time required depends on library size and internet connection speed.


Troubleshooting Sync Library issues requires methodically checking your Apple ID, iCloud settings, OS versions, music formats, and library size limits. Most problems can be fixed with proper configuration. For persistent issues, engage Apple Support for help identifying any underlying problems.

When functioning properly, Sync Library provides seamless access to your personal music collection on all Apple devices. Putting in the effort to troubleshoot is worth it for the convenience and access this feature enables.

With some dedicated troubleshooting using the steps outlined above, you should be able to resolve most common Sync Library errors and finally keep this useful feature enabled for Apple Music.