ASP.Net MVC Authorize attribute not working with Sammy JS

Hello,

 

Regarding this article: 

https://www.c-sharpcorner.com/article/lightweight-single-page-application-with-mvc-and-sammyjs/

 

I have a SPA app using Sammy JS, but get this error when accessing a controller from Sammy JS routing, "Failed to load resource: the server responded with a status of 401 (Unauthorized)". I'm using forms authentication with an api call to authorize the user. How do I get around this error?

 

Thank you,

Debra