diff --git a/src/Models/OpenAI.cs b/src/Models/OpenAI.cs
index e9c7b5ed..0a83d8dc 100644
--- a/src/Models/OpenAI.cs
+++ b/src/Models/OpenAI.cs
@@ -155,7 +155,12 @@ namespace SourceGit.Models
 
             var client = new HttpClient() { Timeout = TimeSpan.FromSeconds(60) };
             if (!string.IsNullOrEmpty(ApiKey))
-                client.DefaultRequestHeaders.Add("Authorization", $"Bearer {ApiKey}");
+            {
+                if (Server.Contains("openai.azure.com/", StringComparison.Ordinal))
+                    client.DefaultRequestHeaders.Add("api-key", ApiKey);
+                else
+                    client.DefaultRequestHeaders.Add("Authorization", $"Bearer {ApiKey}");                
+            }
 
             var req = new StringContent(JsonSerializer.Serialize(chat, JsonCodeGen.Default.OpenAIChatRequest), Encoding.UTF8, "application/json");
             try