Deploy ASP.NET Core app with Angular on IIS

I'm new to the Angular world and I'm trying to deploy an ASP. NET Core app with IIS in a local server. My solution has these projects

When I try to do a HTTP request (e.g. /api/Categories), in debug mode, everything works fine.

Now, when I publish the app in local server, I am able to see the HTML pages, copying the files in dist folder to the root folder of the server, but every HTTP request returns another HTML page that seems to be index.html . Here another image:

I've spent 2 days searching on the internet, finding nothing that works. I tried changing proxy settings, redirecting options, but nothing. Which can be the problem?

File Web.config

<configuration>

<system.webServer>
  <rewrite>
    <rules>
      <rule name="Angular Routes" stopProcessing="true">
        <match url=".*" />
        <conditions logicalGrouping="MatchAll">
          <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
          <add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" />
          <add input="{REQUEST_URI}" pattern="^/(api)" negate="true" />
        </conditions>
        <action type="Rewrite" url="./index.html" />
      </rule>
    </rules>
  </rewrite>
</system.webServer>

</configuration>

File Startup.cs

 public class Startup
{
    readonly string MyAllowSpecificOrigins = "_myAllowSpecificOrigins";

    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public IConfiguration Configuration { get; }

    // This method gets called by the runtime. Use this method to add services to the container.
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddControllersWithViews();
        services.AddControllers();

        services.AddCors(options =>
        {
            options.AddPolicy(name: MyAllowSpecificOrigins,
                              builder =>
                              {
                                  builder.WithOrigins("https://prf.icecat.biz");
                              });
        });

        // services.AddResponseCaching();
        // In production, the Angular files will be served from this directory
        services.AddSpaStaticFiles(configuration =>
        {
            configuration.RootPath = "ClientApp/dist";
        });
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    
    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
        else
        {
            app.UseExceptionHandler("/Error");
            // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
            app.UseHsts();
        }

        app.UseHttpsRedirection();
        app.UseStaticFiles();
        if (!env.IsDevelopment())
        {
            app.UseSpaStaticFiles();
        }

        app.UseRouting();

        app.UseEndpoints(endpoints =>
        {
            endpoints.MapControllerRoute(
                name: "default",
                pattern: "api/{controller}/{action=Index}/{id?}");
        });

        app.UseSpa(spa =>
        {
            // To learn more about options for serving an Angular SPA from ASP.NET Core,
            // see https://go.microsoft.com/fwlink/?linkid=864501

            spa.Options.SourcePath = "ClientApp";

            if (env.IsDevelopment())
            {
                spa.UseProxyToSpaDevelopmentServer("http://localhost:4200");
            }
        });
    }
}