It's the app, the same thing happened to sync a while back
{"error":{"code":"FileAccessDenied","message":"Access to this file was denied for your application.","status":403,"rtfm":"https://github.com/Redgifs/api/wiki/Embedding-gifs#file-access"},"docs":"https://github.com/Redgifs/api/wiki/Embedding-gifs#file-access"}
The last update was 4 months ago so no lol