WeatherKit now returning {"reason": "EXPIRED"}

I've been using the weather kit API for months now without issue, but all of a sudden API queries return the response {"reason": "EXPIRED"}. The code around this area hasn't changed since June and the credentials haven't changed. The JWT is refreshed frequently (well within expiration). Have looked at the generated JWT in jwt.io and Payload and Header details correct and jwt.io reports JWT as "signature verified".

Is the JWT a red herring and its something else?

Here's an example URL:

https://weatherkit.apple.com/api/v1/weather/en_AU/-37.37834963844341/144.76238003519637?dailyStart=2024-12-12T13:00:00Z&dailyEnd=2024-12-13T13:00:00Z&timeZone=Australia/Melbourne&dataSets=forecastDaily

Would appreciate any insights you may have.