You can also check synchronization settings on macOS, open the iBooks application on macOS.

Scroll down and you will find two options named ‘ Sync Bookmarks and Notes‘ and ‘ Sync Collections‘, turn them ON so that all activities will be synced.Go to your phone Settings, then tap on iBooks and confirm whether it is ON or not.You can compare your settings with the ones in the below steps: We will show settings for both devices where you can set options for synchronization. The first and important step is to check if your settings are correct for the synchronization of iBooks. Method 1: Checking Your Synchronization Settings We will start from the most common and simple method to the detailed one. This article will help you with different methods to resolve the issue. If this scenario is applicable, you can resolve the issue by reinstalling the application from the app store. Corrupt Application: if the application you’re using is corrupt or not working properly.Several users finding themselves in a similar situation have reported that they managed to resolve the issue by refreshing the iBooks content which can clear out the cache. The user interface is glitched – Another potential case in which this issue occurs is when the User interface of iBooks application is glitched.You need to enable the synchronization for both devices to synchronize books. Synchronization is disabled – In some cases, settings for synchronization can be responsible for this particular error.

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