Quick try without IDE:

VB.NET Code:
  1. services.AddAuthentication(sub(options)

  2.             options.DefaultScheme = "Cookies";

  3.             options.DefaultChallengeScheme = "oidc";

  4.         End Sub).

  5.         AddCookie("Cookies").

  6.         AddOpenIdConnect("oidc", Sub(options)        {

  7.             options.SignInScheme = "Cookies"

  8.  
  9.             options.Authority = "http://localhost:5000"

  10.             options.RequireHttpsMetadata = false

  11.  
  12.             options.ClientId = "mvc"

  13.             options.SaveTokens = true

  14.         End Sub)