.NET Standard 2.0 WEB.Api Firebase bearer token validation

Startup.cs

public class Startup
    {
        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)
        {
            var firebaseProjectId = "xxxxxx";
            services
            .AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
            .AddJwtBearer(options =>
            {
                options.Authority = $"https://securetoken.google.com/{firebaseProjectId}";
                options.TokenValidationParameters = new TokenValidationParameters
                {
                    ValidateIssuer = true,
                    ValidIssuer = $"https://securetoken.google.com/{firebaseProjectId}",
                    ValidateAudience = true,
                    ValidAudience = firebaseProjectId,
                    ValidateLifetime = true
                };
            });
            services.AddMvc();
           
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            app.UseAuthentication();
            app.UseMvc();
        }
    }