Same issues here. It seems there hasn't been a solution yet? Getting "Failed to discover the client's extension: Error Domain=DeviceActivityReportService.ReportViewController.ClientError Code=2 "(null)" when just trying to render the view on my iOS 17 iPhone, and the DeviceActivityReport View is rendering.

Why don't you just start monitoring that new schedule with a separate activity name? If you use a new activity name, you won't be overwriting the old activity.