Не выполняется запрос к twitch

 using (HttpClient client = new HttpClient(handler)) 
                    { 
                        client.DefaultRequestHeaders.Add("Client-ID", "s92hr2ftp68dka0a6mk6gh1dwrr90h"); 
                        client.DefaultRequestHeaders.Add("Client-Secret", "7ph1qtlyzpuqutlc681b15cvd8hfps"); 
                        client.DefaultRequestHeaders.Add("Authorization", "Bearer "); 
 
                        client.DefaultRequestHeaders.Add("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/112.0.0.0 Safari/537.36 Edg/112.0.1722.58"); 
                        client.DefaultRequestHeaders.Add("Accept-Encoding", "gzip, deflate"); 
                        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json")); 
                        client.DefaultRequestHeaders.Add("Accept", "application/x-mpegURL, application/vnd.apple.mpegurl, application/json, text/plain"); 
                        client.DefaultRequestHeaders.Add("Accept-Language", "en-US,en;q=0.5"); 
                         
                        client.DefaultRequestHeaders.Add("Accept-Encoding", "gzip, deflate, br"); 
                        string getApiTwitch = "{\"operationName\":\"PlaybackAccessToken_Template\",\"query\":\"query PlaybackAccessToken_Template($login: String!, $isLive: Boolean!, $vodID: ID!, $isVod: Boolean!, $playerType: String!) {  streamPlaybackAccessToken(channelName: $login, params: {platform: \\\"web\\\", playerBackend: \\\"mediaplayer\\\", playerType: $playerType}) @include(if: $isLive) {    value    signature    __typename  }  videoPlaybackAccessToken(id: $vodID, params: {platform: \\\"web\\\", playerBackend: \\\"mediaplayer\\\", playerType: $playerType}) @include(if: $isVod) {    value    signature    __typename  }}\",\"variables\":{\"isLive\":true,\"login\":\"" + TwitchBot.channelTwitch + "\",\"isVod\":false,\"vodID\":\"\",\"playerType\":\"site\"}}"; 
                        HttpContent content = new StringContent(getApiTwitch, System.Text.Encoding.UTF8, "application/json"); 
                        HttpResponseMessage response = await client.PostAsync("https://gql.twitch.tv/gql", content); 
 
                        response.EnsureSuccessStatusCode(); 

                        string apiString = await response.Content.ReadAsStringAsync(); 
                        token = apiString.Between("value\":\"", "\",\"signature") 
                        .Replace("\\", "") 
                        .Replace("u0026", "\\u0026") 
                        .Replace("+", "%2B") 
                        .Replace(":", "%3A") 
                        .Replace(",", "%2C") 
                        .Replace("[", "%5B") 
                        .Replace("]", "%5D") 
                        .Replace("'", "%27"); 
                        sig = apiString.Between("signature\":\"", "\","); 
                        client.Dispose(); 
                        getApiTwitch = (string)null; 
                        apiString = (string)null; 
                    }