Api Get Power and Performance Metrics for an App alway emply

Hi support,

I need a solution to get a metric statistic app and display on my website, i did research this API https://developer.apple.com/documentation/appstoreconnectapi/get_power_and_performance_metrics_for_an_app. I did generate a token and i set the token with permission admin and pass auth JWT but when calling to API it is always empty. Could you help me with how to get API and response API or any solution for the problem? Thanks