Shamus Sim Greetings & Welcome to Microsoft Q&A forum!
I understand that you would like to deploy Meta-Llama-3-8B-Instruct model and seeing the error as model is not available.
Please note that For Meta Llama models, the pay-as-you-go model deployment offering is only available with AI hubs created in East US 2 and West US 3 regions.
Regarding the error message, it seems that Meta-Llama-3-8B-Instruct model is not available is not available in the region where you are trying to deploy. In which region you are trying?
Meta model API endpoints can be created in AI Studio projects to Azure Machine Learning workspaces in EastUS2.
I just tried in EastUS2 and it works.
Do let me know if you have any further queries.