Fiddler not capturing traffic from .Net Core

I have a console app that calls a number of 3rd party services via HTTP/HTTPS that was originally written to run under the .Net Framework. Fiddler works fine with that version of the app, capturing all of the HTTP and HTTPS traffic.

I ported the app to .net Core 2.1 and now Fiddler does not capture any of the HTTP/HTTPS traffic from the app.

Any suggestions as to why Fiddler (v5.0) is not working to capture traffic from the .Net Core app?