HowTo register auth for swashbuckle with identity server on asp.net core

Startup.cs

Namespace ProjectWithSwagger
{
    public class Startup
    {
        // This method gets called by the runtime. Use this method to add services to the container
        public void ConfigureServices(IServiceCollection services)
        {
            //....
            services.ConfigureSwaggerGen(swaggerGen =>
            {
                swaggerGen.AddSecurityDefinition("Swagger", new OAuth2Scheme
                {
                    AuthorizationUrl = UriCreate(Configuration.IdentityServerSettings.Authority, "/connect/authorize").ToString(),
                    Flow = "implicit",
                    TokenUrl = UriCreate(Configuration.IdentityServerSettings.Authority, "/connect/token").ToString(),
                    Scopes = { { "api.name", "The Scope needed to access API" } }
                });
            }
        }
        
        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline
        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory,
            IAppointmentPlusService aps, IMigrationsHandler mh)
        {
            app.UseSwagger(c =>
            {
                c.RouteTemplate = "swagger/{documentName}/swagger.json";
            });

            // Enable middleware to serve swagger-ui assets (HTML, JS, CSS etc.)
            app.UseSwaggerUi(c =>
            {
                c.ConfigureOAuth2("api.name.swagger", SwaggerSecret, "swagger-ui-realm", "API Swagger UI");
            });

            app.UseIdentityServerAuthentication(new IdentityServerAuthenticationOptions
            {
                Authority = Configuration.IdentityServerSettings.Authority,
                RequireHttpsMetadata = !_env.IsDevelopment(),
                ApiName = "api.name",
                SupportedTokens = SupportedTokens.Both
            });
      }
}