.NET Core 2.2 CORS不允许请求

我已经检查了其他几个线程，但仍然无法解决这个问题.我想允许任何源，标头，方法等访问我的.NET Core 2.2 API.

I have checked several other threads on this and still can't manage to figure this out. I'm wanting to allow any origin, header, method, etc. to access my .NET Core 2.2 API.

public void ConfigureServices(IServiceCollection services)
    {
        services.AddCors();
        services.AddMvc();  
... 

public void Configure(IApplicationBuilder app, IHostingEnvironment env, IApplicationLifetime lifetime, IDistributedCache cache)
    {
        app.UseCors(builder => builder.AllowAnyOrigin()
        .AllowAnyMethod()
        .AllowAnyHeader()
        .AllowCredentials());

我确保首先在ConfigureServices和Configure中调用CORS方法.我正在本地和服务器上对此进行测试，并且在Chrome中都遇到了相同的错误.

I made sure the CORS methods were called first within ConfigureServices and Configure. I'm testing this locally and from the server and get this same error on both in Chrome.

Access to XMLHttpRequest at 'https://xxxxx.azurewebsites.net/api/Employees/getCurrentEmployee' from origin 'https://xxxxxxxxxx.azurewebsites.net' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.