Wait for iTunes to complete your sync, and go ahead and toggle iCloud Music Library back on. A pop-up dialog box will appear asking if you want to keep your music or delete and replace.

Greetings, I am trying to move my iTunes music library from my old iMac (which I am retiring due to its being out of SW support) to a new Windows 10 PC that I am using for such things. The library ...

Transferring photos, backing up files, or syncing music, there comes a time when every iPhone user has to connect the device ...

You can turn off your iCloud music library to stop syncing your music across all of your Apple devices.

The issue occurred whenever an ‌Apple Music‌ library sync was attempted within the Music app on macOS or in iTunes on Windows PCs.