This endpoint is deprecated. If you're reading this on a browser, there's a good chance you can change the v8 part on the URL to v9 and get away with it. ;) If you're using the API directly, please update your use case to rely on the new API endpoints, available under /sync/v9/ or /rest/v2/ prefixes. For more details, please see documentation at https://developer.todoist.com/guides/#our-apis