Chesterfield,AM (pgr) Apologies for the delayed response. Thanks for the additional details.
Region is where is your Azure OpenAI resource is deployed.
You can see the region in Azure OpenAI resource deployed in Azure Portal or top right corner on the OpenAI Studio.
Regarding your specific query, I would suggest you, create a new OpenAI resource in the desired region again and check.
can I switch region to access chat GPT 4 model?
Switching the regions is not possible. But GPT-4 and GPT-4-32k are now available to all Azure OpenAI Service customers. Availability varies by region. If you don't see GPT-4 in your region, please check back later.
Please see Model summary table and region availability for more details.
Hope this helps. Do let me know if you have any further queries.