Got this message from email when submitting an app to test flight around GMT+7 2pm.
The app references non-public symbols in Frameworks/AmazonIVSPlayer.framework/AmazonIVSPlayer: _CMTimebaseCreateWithMasterClock. If method names in your source code match the private Apple APIs listed above, altering your method names will help prevent this app from being flagged in future submissions. In addition, note that one or more of the above APIs may be located in a static library that was included with your app. If so, they must be removed. For further information, visit the Technical Support Information at http://developer.apple.com/support/technical/