Spa with Net5.0 avoid in fall back the loss of QueryString

for my english since i m not native. First i m using Angular front/Net 5.0 back. My problem is, every time that i go to my Spa aplication (From another aplication that handles login) i loose the query string and redirect to /, how can i configure the aplication to not loose the query string? this is my configure service.

  public void ConfigureServices(IServiceCollection services)
    {
        string mySqlConnectionStr = Configuration.GetConnectionString("DefaultConnection");
        services.AddControllers();
        services.AddDbContextPool<recursoContext>(options => options.UseMySQL(mySqlConnectionStr));
        services.AddLogging();
        
        services.AddSwaggerGen(c =>
        {
            c.SwaggerDoc("v1", new OpenApiInfo { Title = "WebContainerUI", Version = "v1" });
        });
        services.AddSpaStaticFiles(configuration =>
        {
            configuration.RootPath = "/";
            
        });
    }

and this is my configure

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
            app.UseSwagger();
            app.UseSwaggerUI(c => c.SwaggerEndpoint("/swagger/v1/swagger.json", "WebContainerUI v1"));
        }

        app.UseHttpsRedirection();
        app.UseDefaultFiles();
        app.UseStaticFiles();
        app.UseRouting();
        app.UseMiddleware<Jwt.JwtMiddleware>();
        app.UseAuthorization();
        app.UseEndpoints(endpoints =>
        {
            endpoints.MapControllers();
            endpoints.MapFallbackToFile("/index.html");
        });

        app.UseSpa(spa =>
        {
            // To learn more about options for serving an Angular SPA from ASP.NET Core,
       

            if (env.IsDevelopment())
            {
                // spa.UseAngularCliServer(npmScript: "start");
            }
        });
       
    }

Also the objetive of the aplication is handle a JwT as a method of authetication without a session (no cookie there). Since i m learning dont know the best way to put this toguether, would like to hear some recomendations. Thanks for your help.

Just if some one has the same problem, it has nothing to do with Spa redirection/fallback of .Net Core, The problem came of how angular (Client side) do routes, so the token was receive by the front, but erased somehow with a redirect (client side).