Is it an occasional case or a consistent phenomenon? 400 error is a general client-side error. There is no required property in the GetTitleNewsRequest and no GetTitleNews specified errors in response part. Hence this could be tricky.
Have you modified the Global Title Policy? Please check in [Game Manager]->[Settings]->[API Features]. In addition, please make sure you do not enable ‘Disable all API request access’
Otherwise, perform a clean uninstall of your SDK and reinstall it in case there are corrupted files. If this error keeps showing, you can try to catch http call packets for analysis.
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