I found a solution to this problem after losing a full day. Thanks again to Apple for releasing an update that serves no purpose other than making life even harder for us developers. Every time an update is released, I dread installing it because I know very well that many apps will stop working after the update. I had coded two applications that use iTunesLibrary. They worked perfectly before, but now they don't work anymore, throwing the same error: Code=4097 connection to service named com.apple.amp.library.framework. Based on the documentation, I suspected an issue with sandboxing, entitlements, or binary signing ... but no, that wasn’t the root of the problem. After trying to mimic some behaviors of the Music app, like com.apple.amp.artwork.client, com.apple.amp.devices.client, com.apple.amp.library.client, com.apple.security.files.user-selected.read-only ... and experimenting with various options (some documented, some not), I stumbled upon something incredible that gave me the solution: I had moved my