why o1-preview is unavailable model?

[bsbrother]

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1. My email got "[GitHub] You have been granted access to GitHub Models limited public beta"

2. When access https://github.com/marketplace/models/azure-openai/o1-preview/playground, chat error:
   bsbrother now
   hi
   o1-preview now
   Unavailable model: o1-preview

3. When run example code error:
   azure.core.exceptions.HttpResponseError: (unavailable_model) Unavailable model: o1-preview
   Code: unavailable_model
   Message: Unavailable model: o1-preview

thank you!