This issues persists in beta 4. It worked briefly this morning, but this afternoon I get the error below. Interestingly it happens for a new build. The build I installed this morning on my test device still works.
[AuthService] Failed to generate jwt token for: com.apple.weatherkit.authservice with error: Error Domain=AMSErrorDomain Code=12 "Mescal Failed" UserInfo={NSLocalizedDescription=Mescal Failed, NSLocalizedFailureReason=SAPInit failed: -42049}