App Store, iTunes, and Apple Music Services down on iOS 11.3.1

As of this week, my iPhone 7 Plus on iOS 11.3.1 can no longer connect to my Apple Music subscription, App Store, or iTunes store. Apple Music simply reports: "We've run into a problem", while iTunes and App Store cannot connect. I cannot update my device unfortunately, and I never received any notice these services (including one I pay for) would be discontinued.

For any technical guys or developers:

In Apple Music, the failing request is to: https://init[.]itunes.apple.com/bag.xml?ix=6&os=11&locale=en_US

And the resulting syslog error:

<ICStoreURLSession: 0x1c42809b0> finished task <__NSCFLocalDataTask: 0x119a2e5f0>{ taskIdentifier: 3 } { completed } for request <ICStoreURLRequest: 0x1c43fbf00>[Music/3.1][requestContext=<ICStoreRequestContext: 0x1c02a3600>]. err=Error Domain=ICErrorDomain Code=-7100 "(null)" UserInfo={NSUnderlyingError=0x1c4e5a3a0 {Error Domain=NSURLErrorDomain Code=-999 "cancelled" UserInfo={NSErrorFailingURLStringKey=https://init.itunes.apple.com/bag.xml?ix=6&os=11&locale=en_US, NSLocalizedDescription=cancelled, NSErrorFailingURLKey=https://init.itunes.apple.com/bag.xml?ix=6&os=11&locale=en_US}}}

App Store and iTunes are pretty much the same error from the same endpoint, with slightly different parameters.

Any information or help would be greatly appreciated.

Thank you.