WeatherKit fails with WDSJWTAuthenticatorServiceListener.Errors Code=2

WeatherKit consistently fails with the following error: WDSJWTAuthenticatorServiceListener.Errors Code=2 This happens on a physical device regardless of the troubleshooting steps I try. After the error occurs, the app uses a third-party fallback provider successfully.

The issue appears similar to failures reported by other developers on iOS 26, even though the WeatherKit entitlement and signing configuration seem valid.

I have verified the following:

•	The signed application binary contains the WeatherKit entitlement.
•	The embedded provisioning profile contains the WeatherKit entitlement.
•	The application identifier and team identifier match the provisioning profile.
•	The WeatherKit capability was disabled, saved, enabled again, and saved.
•	Xcode automatic signing generated a new provisioning profile after resetting the capability.
•	The project was cleaned and a fresh build was installed on the physical device.
•	Both the application and the device were restarted.
•	Location permission is granted and the app receives valid coordinates.
•	Network connectivity works correctly.
•	A non-Apple fallback weather provider successfully returns a forecast for the same coordinates.

Despite this, every WeatherKit request still fails with WDSJWTAuthenticatorServiceListener.Errors Code=2. Has anyone identified the cause of this error on iOS 17 or 26 or found an additional signing, entitlement, App ID, or provisioning step required to resolve it?

Environment: • iOS version: iOS: 26.6 (23G71) • Xcode version: 26.5 • Device: iPhone 14 Pro • WeatherKit API used: WeatherService.shared • Distribution method:TestFlight