Hit the same issue. I think it's a problem with the MapKit APIs that failed to get response from local data provider (Amap in China).
Filed a ticket in Feedback. I would suggest you file another one to make the issue heared.
https://feedbackassistant.apple.com/feedback/15544549
Sheffield
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Hit the same issue.
In my case, the request fails even when naturalLanguageQuery is not nil.
@DiP How do you fix the issue?