IdentityServer4 and Azure AD - Getting blank page 404 to login.live after entering credentials

I am trying to setup Azure AD as an external provider for IdentityServer4 in a development environment. Google and Facebook providers already are hooked up successfully. I'm directed to the login page on login.microsoft.com where I enter my login id and select an MS account, it then directs me to login.live.com as a blank page (404) instead of redirecting back to my IdentityServer instance.

I've tried a bunch of things but have had no luck.

Do I need to enable Enterprise Applications in Azure?

Am I missing something?

IdentityServer URL: http://localhost:5000

IdentityServer URL: http://localhost:47740

...
app.UseOpenIdConnectAuthentication(CreateAzureAdOptions(clientId, tenantId));
...

 public static OpenIdConnectOptions CreateAzureAdOptions(string clientId, string tenentId)
    {
        return new OpenIdConnectOptions
        {
            DisplayName = "Azure Active Directory",
            AuthenticationScheme = "Azure",
            ClientId = clientId,
            Authority = string.Format(CultureInfo.InvariantCulture, "https://login.microsoftonline.com/{0}", tenentId),
            ResponseType = "id_token",
            Scope = { "openid" },
            SignInScheme = IdentityServerConstants.ExternalCookieAuthenticationScheme,
            AutomaticChallenge = true,
            AutomaticAuthenticate = true,
            RequireHttpsMetadata = false,
            TokenValidationParameters = new TokenValidationParameters
            {
                ValidateIssuer = false
            }
        };
    }