With Azure OpenAI , you don't call a raw "model name" directly; you call a deployment of that model.
SDKs and REST require:
the resource endpoint ,
the API key (or Entra ID token), and
the deployment name to target the specific model instance.
References
Azure OpenAI quickstart (connect using endpoint, key, and deployment name ).
https://learn.microsoft.com/azure/ai-services/openai/quickstart
Chat/completions-path uses /deployments/{deployment-id}.
https://learn.microsoft.com/azure/ai-services/openai/reference#chat-completions