For what it’s worth, I’m experiencing a similar issue, but only on certain devices. The one thing they have in common is that they show the Beta Updates option under Software Update. Aside from that, everything else is consistent, including the fact that they’re all running the latest iOS 18.5. Interestingly, my Apple Developer certificate expired and was renewed around the same time I started seeing the error. Like the original poster, all entitlements, capabilities, and certificates are correctly configured. This setup was working fine before, and there haven’t been any code changes related to WeatherKit. Here's my post that may be related to this: https://developer.apple.com/forums/thread/788811

More insights. Turns out my Apple Developer certificate expired today and was reissued, which must have triggered a regeneration of provisioning profiles and entitlements. Even though the entitlements are now correctly set in Xcode, the updated entitlement data may not have fully propagated to some of my iPhones that are configured in Developer Mode, especially the ones I haven’t rebooted or reinstalled the app on since the change. Other devices without Developer Mode enabled are still working fine. That's my hypothesis.

More details, this is what the error is: Failed to generate jwt token for: com.apple.weatherkit.authservice with error: Error Domain=WeatherDaemon.WDSJWTAuthenticatorServiceListener.Errors Code=2 "(null) Couldn't read values in CFPrefsPlistSource<0x1294c0f00> (Domain: group.com.darkMatter.SafeTan, User: kCFPreferencesAnyUser, ByHost: Yes, Container: (null), Contents Need Refresh: Yes): Using kCFPreferencesAnyUser with a container is only allowed for System Containers, detaching from cfprefsd Again, this is just for a few select devices 🤔

Just to give a clearer picture of what I’m observing. FYI, notifications are triggered based on the user’s selected UV index threshold. Here’s an example timeline: Alert at 8:30 AM – “UV index near 4 between 9:30 AM and 5:00 PM. Peak: 4” Alert at 11:30 AM – “UPDATED: UV index near 4 and above between 9:30 AM and 3:30 PM. Peak: 5” Alert at 2:15 PM – “UPDATED: UV index near 4 between 9:30 AM and 5:00 PM. Peak: 4” Alert at 2:30 PM – “UPDATED: UV index near 4 and above between 9:30 AM and 3:30 PM. Peak: 5” It is as if Apple Weather pulls from two alternating weather services. If anyone has insights into why the forecast keeps toggling like this, I’d appreciate the explanation.