I am attempting to get reports data out of the Graph API. I get nothing back as a response. No error, no data. I have tried several different endpoints, all with the same result.
Example URL: https://graph.microsoft.com/1.0/reports/getSharePointSiteUsageDetail(period='D7')
The same issue occurs whether I'm using PowerShell Invoke-WebRequest, or the Graph Explorer site.
It can't be a permissions issue, as there is no error about permissions, and my account has the necessary 'Reports.Read.All' permission.
What is going on?

