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
            });
      }
}

How would you do this if you want to access Azure Ad via Identity Server? I have the issue that either the Identity Server redirect is sending something weird back to the Swagger UI or the Swagger UI is not accepting the IdentityServer token.

The UseIdentityServerAuthentication extension method comes from IdentityServer4? I don't know if this is ever mentioned but I just thought I'd throw a confirmation out there. I guess what I mean (to be more specific), is which NuGet packages are you dependent on here?

I think this example might be a bit dated. It's probably Swashbuckle.AspNetCore and
IdentityServer4.AccessTokenValidation. I think that it might have become a bit easier to configure with later versions of Swashbuckle.