If for example the bucket region is being specified as per Google cloud's nomenclature (eg: us-west2 as compared to AWS' us-west2), the error message returned is as below:  

500 Server Error: Internal Server Error for url: https://services.sentinel-hub.com/api/v1/statistics/batch
Server response: "{"status": 500, "reason": "Internal Server Error", "message": "Something went wrong. Incident id: null", "code": "COMMON_EXCEPTION"}"

Issue here has to do with Error messaging and how it could more accurately help identify the issue rather than a simple internal server error.