The Halo: Reach stats app is no longer available, please reference your in-game Service Record for detailed stats.
This is likely related to the issues with Reach at the moment - 343 have responded and are aware of the issue
https://www.halowaypoint.com/en-us/forums/cdecc00475c645b9a4d0a156fb542d59/topics/343-response-reach-servers-down/57350f64-2ad9-4189-8c18-79084a3dccb9/posts