Starting the night of August 30th, the REST API endpoint: https://graph.microsoft.com/v1.0/reports/getOffice365ActiveUserDetail(period='D30') is no longer working. Tried all the different options for period value (D7,D90,D180). This endpoint has been working without issue for as long as we've been using it (going back almost 2 years)
By no longer working, the status_code being returned is 200 - and the csv is being returned with column headers, but no user data is included.
Note that using the date parameter is working as expected (returning column headers and data): https://graph.microsoft.com/v1.0/reports/getOffice365ActiveUserDetail(date=2021-08-10)