Jul 10, 2019 05:53 PM|mgebhard|LINK
Use the browser's dev tool (F12) to view the actual response. Most likely it is an error caused by an exception. Errors are not CORS compliant by default. Also try setting a break point and run your code through the Visual Studio debugger as it is not
clear where you are calling the token end point. Has this code ever worked? Did you copy the resource own grant validation from a tutorial?