diff --git a/RelayBotSample/BotConnector/BotService.cs b/RelayBotSample/BotConnector/BotService.cs
index 4a239143..4a4f9349 100644
--- a/RelayBotSample/BotConnector/BotService.cs
+++ b/RelayBotSample/BotConnector/BotService.cs
@@ -39,7 +39,7 @@ public async Task<string> GetTokenAsync()
             {
                 httpRequest.Method = HttpMethod.Get;
                 UriBuilder uriBuilder = new UriBuilder(TokenEndPoint);
-                uriBuilder.Query = $"botId={BotId}&tenantId={TenantId}";
+                uriBuilder.Query += $"&botId={BotId}&tenantId={TenantId}";
                 httpRequest.RequestUri = uriBuilder.Uri;
                 using (var response = await s_httpClient.SendAsync(httpRequest))
                 {