Some Apple Music Subscribers Experiencing Library Syncing Issue Across the iPhone and Mac
Over the past few months, some users have been unable to sync their Apple Music library between their iPhone and Mac, seemingly due to a bug.

Affected users receive the following error message in the Music app on the Mac:
Genius results can't be updated right now. An unknown error occurred (18004).
There are complaints about the issue across the Apple Support Community, MacRumors Forums, Reddit, and elsewhere on the internet.
The underlying cause of the issue is unclear, and it's not entirely clear if a fix will require software updates, or if Apple can implement a server-side fix. We've reached out to Apple for comment, and we'll update this story if we receive a response.
This issue comes after another Apple Music bug related to playlists was fixed last month.
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