I'm having the same problem. The most frustrating thing is that the widget is working fine in the version of our app that is currently available in the App Store. We are prepping the next version (the widget hasn't been touched, only the main app) and now the widget refuses to run. We can't detect anything that would be causing such an issue.

Still an issue. Can NOT sign in with Apple on the simulator. Has Apple ever tried to do this themselves?