iOS 16 Music Kit MusicLibrary methods have stopped working

Hi there,

I have a related forum thread here and a Feedback Assistant ticket open, but this issue seems different.

Sometime within the last 2-3 weeks, code related to MusicLibrary has stopped working. None of my code has changed.

For example, the below two snippets used to work fine:

 for track in newTracks { 
   try await MusicLibrary.shared.add(track, to: targetPlaylist)
 }

try await MusicLibrary.shared.edit(targetPlaylist, items: items)

newTracks and items are both fetched using:

try await targetPlaylist.with(.tracks, preferredSource: .catalog).tracks

Using preferredSource: .catalog was a workaround used to address the issue in the aforementioned post above.

All iOS 16 capable functions are decorated with:

@available(iOS 16, *)

or in an if block:

if #available(iOS 16, *) {...

What's happening is that the following is showing up in the console:

2022-11-28 23:31:11.279648+0700 MyApp[38653:6736450] [core] Attempted to register account monitor for types client is not authorized to access: {(
    "com.apple.account.iTunesStore"
)}

2022-11-28 23:31:11.279718+0700 MyApp[38653:6736450] [Default] <ICUserIdentityStoreACAccountBackend: 0x282adb520> Failed to register for account monitoring. err=Error Domain=com.apple.accounts Code=7 "(null)"

2022-11-28 23:31:11.279758+0700 MyApp[38653:6736450] [Default] ICUserIdentity - Unable to retrieve DSID for userIdentity=<ICUserIdentity 0x2806eb120: [Active Account: <unresolved>]> - error=Error Domain=com.apple.accounts Code=7 "(null)"

These errors are not caught by a do/catch block, but I assume they are related to the issue, and I believe they have to do with MyApp trying to access things that Music Kit thinks it's not supposed to. For example, if MyApp attempts to work with a playlist that it did not create, errors would be expected, thrown errors.

The thing is that I know I'm working with resources that are created by MyApp.

In fact, in trying to test this, I just tried to create a playlist with the below, and the same behavior is occurring:

@available(iOS 16, *)
func createPlaylist2(name: String, description: String) async -> MusicKit.Playlist? {
    do {
        Logger.log(.info, "Creating Playlist: \(name)")
        Logger.log(.shrug, "Does this work?")
        let newPlaylist = try await MusicLibrary.shared.createPlaylist(name: name, description: description)  // <= Things stop here!
        Logger.log(.success, "New playlist created: \(newPlaylist)") // <= this isn't logged.
        return newPlaylist // <= nothing is returned
    } catch {
        Logger.log(.error, "Could not create new playlist: \(error)") // <= no error logged.
    }
    return nil
}

The result is:

2022-11-29 00:15:01.875064+0700 MyApp[38794:6760471] [core] Attempted to register account monitor for types client is not authorized to access: {(
    "com.apple.account.iTunesStore"
)}

2022-11-29 00:15:01.875372+0700 MyApp[38794:6760471] [Default] <ICUserIdentityStoreACAccountBackend: 0x283005720> Failed to register for account monitoring. err=Error Domain=com.apple.accounts Code=7 "(null)"

2022-11-29 00:15:01.876677+0700 MyApp[38794:6760323] [EntityQuery] Finished executing query in 0.000999928s

2022-11-29 00:15:01.889055+0700 MyApp[38794:6760323] [EntityQuery] Finished fetching results in 0.0120001s

2022-11-29 00:15:01.891235+0700 MyApp[38794:6760329] [core] Attempted to register account monitor for types client is not authorized to access: {(
    "com.apple.account.iTunesStore"
)}

2022-11-29 00:15:01.891684+0700 MyApp[38794:6760329] [Default] <ICUserIdentityStoreACAccountBackend: 0x283005720> Failed to register for account monitoring. err=Error Domain=com.apple.accounts Code=7 "(null)"

📘 Creating Playlist: TEST PLAYLIST

🤷🏻‍♀️ Does this work?

2022-11-29 00:15:06.697374+0700 MyApp[38794:6760329] [] nw_path_necp_check_for_updates Failed to copy updated result (22)

What's really nasty is that errors are not thrown, so they can't be caught and handled in a catch block.

I know that iOS 16.1 got released around the end of October, but I really don't know what's going on here.

The behavior is showing up in both prod and when testing locally.

Any help would be most appreciated.

@JoeKhun: Did I miss the memo?