Is everyone still experiencing this in 14.2? Is there a way to speak with Apple engineers about these sorts of issues?

Were you able to figure this out? I am running into the same issue.

Hello, I am also running into this issue. Most songs play wonderfully, but others consistently won't play. For example, I am unable to play Tones and I - Dance Monkey, id: 1475546088.  [SDKPlayback] Failed to prepareToPlay error: Error Domain=MPMusicPlayerControllerErrorDomain Code=6 "Prepare queue failed with unexpected start item" UserInfo={NSDebugDescription=Prepare queue failed with unexpected start item} Using the same code, I can play DJ Khaled - POPSTAR (feat. Drake), id: 1523923824. In both cases, the MPMusicPlayerStoreQueueDescriptor.startItemID and MPMusicPlayerStoreQueueDescriptor.storeIDs properties look correct. I have tried using both MPMusicPlayerController.applicationQueuePlayer and MPMusicPlayerController.systemMusicPlayer. I am on iOS 13.6. Any help will be much appreciated, and I hope we can figure this out!

I am pretty sure I was experiencing an error related to having renamed some images in Assets.xcassets in Xcode. This thread was very helpful: https://developer.apple.com/forums/thread/106261 I say pretty sure because the app has been rejected again, but this time for a different reason :) In terms of Xcode not properly symbolicating the error logs, I realized I hadn't updated iOS or Xcode to the most recent versions, so that may have been the cause. Updated and onward! Thank you very much for your help. I hope this thread helps someone else.

Hello eskimo, Thank you for your reply. Following the instructions on the Adding Identifiable Symbol Names to a Crash Report page, I have been able to apply the appropriate .dSYM file to the crash report to identify lines associated with that particular .dSYM file (FunkyFundz.app.dSYM). However, as you noted, the rest of the stack trace is not symbolicated. How can I go about symbolicating the rest of the crash report? When I look in the dSYMs folder inside the .xcarchive I see .dSYM files associated with my app and my third party libraries. However, in the stack trace I am trying to identify things like libsystem_kernel.dylib, CoreFoundation, and UIKitCore. I do not see .dSYM files for these. Should I be asking Xcode to generate and apply these somehow? Thank you so much for your help and clarification. :) Marvin