Download Report from Apple Store

We are using the apple developer API https://developer.apple.com/documentation/appstoreconnectapi/download_sales_and_trends_reports We are able to generate the token and we can get the data from https://api.appstoreconnect.apple.com/v1/apps how ever when we are trying to get data from https://api.appstoreconnect.apple.com/v1/salesReports , it is showing unauthorised access error. We have admin right for our private Key.