SKCloudServiceController's requestPersonalizationToken returns expired token in iOS 14

Number:rdar://FB8082757 Date Originated:07/21/2020
Status:Open Resolved:
Product:StoreKit Framework Product Version:iOS 14 Beta 2
Classification:Bug Reproducible:Always
Last reproduced on iOS 14 (18A5319i) on an iPhone X.

Steps to reproduce: 

1. Generate a valid MusicKit Developer Token.
2. Use SKCloudServiceController's `requestPersonalizationToken(forClientToken:completionHandler:)` function to get a user token.
3. Perform an Apple Music API request that specifically requires a user token, for example fetching Recommendations (
4. Apple Music API callback will fail with a 403 error code and error as Invalid authentication.

This happens only on iOS 14. All iOS versions before that including the latest iOS 13 do not exhibit this issue.

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