Have been having the same issue for 3 days now. WeatherKit is enabled in both Capabilities and App Services as well as being added as a capability in Xcode. Even created a new provisioning profile and no dice. Very frustrating...

A bug report has been filed for this issue: FB11500541.

This issue still persists in Xcode 14.1 RC and iOS 16.1/Ventura 13.0. I believe I'm accessing the property correctly; am I missing something obvious here?