diff --git a/OpenHarbor.JwtTokenManager/JwtTokenManagerService.cs b/OpenHarbor.JwtTokenManager/JwtTokenManagerService.cs
index f400758..d6b919c 100644
--- a/OpenHarbor.JwtTokenManager/JwtTokenManagerService.cs
+++ b/OpenHarbor.JwtTokenManager/JwtTokenManagerService.cs
@@ -31,7 +31,7 @@ public class JwtTokenManagerService(JwtTokenManagerOptions options, IHttpClientF
       new ("scopes", string.Join(" ", _scopes))
     };
 
-    if (options.IsCredentialsInHeader)
+    if (false == options.IsCredentialsInHeader)
     {
       formContentKeyValues.AddRange([
         new KeyValuePair<string, string>("client_id", options.ClientId),
@@ -45,8 +45,9 @@ public class JwtTokenManagerService(JwtTokenManagerOptions options, IHttpClientF
       Content = formContent
     };
     
-    if (false == options.IsCredentialsInHeader)
+    if (options.IsCredentialsInHeader)
     {
+      
       var credentials = Convert.ToBase64String(Encoding.ASCII.GetBytes($"{options.ClientId}:{options.ClientSecret}"));
       request.Headers.Authorization = new AuthenticationHeaderValue("Basic", credentials);
     }