How can I debug authorization issues in my .NET Core application?

Debug authorization issues by inspecting the application's authorization logic (e.g., the code where you apply `AuthorizeAttribute` or custom authorization checks). Use logging to record user identity and authorization decisions. Enable detailed error logging in IIS to capture more information about the 403 error. Utilize a debugger to step through the authorization code and identify where the permission check is failing. Also, test with different user accounts and roles to ensure proper authorization is in place.