It looks like you don't have any logger set up, do you?
If you're running ASP.NET Core with
Hangfire.AspNetCore package, the logger is set up automatically by
services.AddHangfire() method (you just may need to adjust logging level in the appsettings.json).
Otherwise you need to configure it manually (by calling a corresponding extension method on GlobalConfiguration, e.g.
UseLog4NetLogProvider()) before you can see any exceptions logged.