Audio completions samples do not work with Phi 4.0 Multimodal Instruct Serverless deployment

- **Package Name**:
- Name: azure-ai-inference
- **Package Version**:
Version: 1.0.0b9-
- **Operating System**:
- W11
- **Python Version**:
- Python 3.10.9 | Anaconda

**Describe the bug**
I want to run audio completions with Phi-4-multimodal-instruct.
I have followed this example (as it is) and it doesnt work (get 422 Error code)
https://github.com/Azure/azure-sdk-for-python/blob/azure-ai-inference_1.0.0b9/sdk/ai/azure-ai-inference/samples/sample_chat_completions_with_audio_data.py

**To Reproduce**
Steps to reproduce the behavior:
1. Create a Phi-4-multimodal-instruct serverless deployment on Azure foundry.
2. Run the example https://github.com/Azure/azure-sdk-for-python/blob/azure-ai-inference_1.0.0b9/sdk/ai/azure-ai-inference/samples/sample_chat_completions_with_audio_data.py as it is.
3. I get the following error :
Error occurred: HttpResponseError
Error details: (Invalid input) invalid input error
Code: Invalid input
Message: invalid input error
Status code: 422

**Expected behavior**
Get completion result

**Screenshots**
N/A

**Additional context**
N/A