Fix getting models from Azure Open AI resource if it is connected through Entra ID. (Azure#50992)

* Fix getting models from Azure Open AI resource if it is connected through Entra ID.

* Fix changelog

Author: nick863

sdk/ai/Azure.AI.Projects/CHANGELOG.md

@@ -7,6 +7,7 @@
 ### Breaking Changes
 
 ### Bugs Fixed
+* Fix getting model deployed on the Azure Open AI resource, if the resource is authenticated using Entra ID. [see GitHub issue 49064](https://github.com/Azure/azure-sdk-for-net/issues/49064)
 
 ### Other Changes
 
@@ -39,7 +40,7 @@ AI models deployed to the Project's AI Services.
 * New sample added for connected agent tool.
 
 ### Bugs Fixed
-* Fix for filtering of messages by run ID [see GitHub issue issue 49513](https://github.com/Azure/azure-sdk-for-net/issues/49513).
+* Fix for filtering of messages by run ID [see GitHub issue 49513](https://github.com/Azure/azure-sdk-for-net/issues/49513).
 
 ## 1.0.0-beta.7 (2025-04-18)
 

sdk/ai/Azure.AI.Projects/src/Custom/Inference/Inference.cs

@@ -168,7 +168,10 @@ private AzureOpenAIClient CreateAzureOpenAIClient(string? connectionName = null,
                     string apiKey = apiKeyCreds.ApiKey;
                     return new AzureOpenAIClient(new Uri(endpoint), new ApiKeyCredential(apiKey));
                 }
-                ;
+                else if (selectedConnection.Credentials is EntraIDCredentials)
+                {
+                    return new AzureOpenAIClient(new Uri(endpoint), this._tokenCredential);
+                }
             }
             ClientConnection connection = this.GetConnection(typeof(AzureOpenAIClient).FullName!);