I am very first time to use WeatherKit eventhough 8 years experience as of 73 year old programmer. I faced same error, but I was missing to check two tags on the following instructions; the mistakeI took was the last instruction on NOTE, which is App Capability tag. Please check again two tags, App Services tag and App Capability tag.
Configure app services
WeatherKit
WeatherKit allows you to access the Apple Weather service.
Enable WeatherKit for an App ID
In Certificates, Identifiers & Profiles, click Identifiers in the sidebar.
On the top left, click the add button (+), select App IDs, then click Continue.
Register an App ID.
Click the App Services tab.
Select the WeatherKit checkbox.
Click Continue, review the registration information, and click Register.
Note : Remember to also enable WeatherKit in the App Capabilities tab when editing your App ID.
SatoshiSatoJPN
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