.NET Core 3.1 CORS not working on Ember (3.12) web UI

I have followed the Microsoft migration instructions and placed the call to the CORS middleware between UseRouting and UseEnpoints. However, I am still getting CORS errors.

In the ConfigureServices method, I have: Services.AddCors(); In the Configure method, I have:

app.UseRouting();

app.UseCors(options => options
        .AllowAnyOrigin()
        .AllowAnyHeader()
    );

app.UseAuthentication();

app.UseEndpoints(endpoints =>
{
    endpoints.MapControllers();
});

The console error is:

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://localhost:5000/users/login. (Reason: CORS header ‘Access-Control-Allow-Origin’ missing).

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://localhost:5000/users/login. (Reason: CORS request did not succeed).

Any idea what is causing the problem?