login.cs

        public IActionResult Get()
        {
            var redirectUri = WebUtility.UrlEncode("https://localhost:5001/home/callback");
            var urlString = @$"https://id.twitch.tv/oauth2/authorize?client_id={_configuration["TwitchClientId"]}"
                            + $"&redirect_uri={redirectUri}"
                            + "&response_type=code"
                            + "&scope=openid";

            return Redirect(urlString);
        }