405 error when making DELETE request from asp.net core application

I have an asp.net core API from which I am trying to make a DELETE request to another asp.net core API. When I call the first API, when it makes a delete call to the second API, I get a 405 error. I've tried the solutions found here; ASP.NET Core with IIS - HTTP Verbs Not Allowed , and a few other related solutions, without success. I also tried enabling Cross-Origin Requests (CORS) in the Startup.cs file , but nothing seems to change.

Here is my delete endpoint:

    [HttpDelete("MyDeleteEndpoint")]
    public async Task MyDeleteEndpoint([FromRoute] string id)
    {
        var http = new HttpClient();

        var response = await http.DeleteAsync("https://myserver:443/api/mycontroller/{id});

        //do more stuff
    }    

Here is my web.config:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <system.webServer>
    <modules runAllManagedModulesForAllRequests="false">
      <remove name="WebDAVModule" />
    </modules>
  </system.webServer>
</configuration>  

Here is my ConfigureServices and Configure method in Startup.cs:

public void ConfigureServices(IServiceCollection services)
{
  services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);

  services.AddCors(options =>
  {
      options.AddPolicy("mypolicy",
      builder =>
      {
          builder.AllowAnyOrigin().AllowAnyHeader().AllowAnyMethod();
      });
  });
}

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
    if (env.IsDevelopment())
    {
        app.UseDeveloperExceptionPage();
    }
    else
    {
    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
         app.UseHsts();
    }

    app.UseCors("mypolicy");
    app.UseHttpsRedirection();
    app.UseMvc();
}

Any ideas on what I might be doing wrong?