Dzmitry Zimin Greetings & Welcome to Microsoft Q&A forum!
Could you confirm if you have requested for Azure OpenAI access using this form?
Can you share your application ID?
But in Azure AI Studio Azure OpenAI not accessible and there aren't chat gpt models.
In Which region your AI studio is deployed? Do you have the required role access? you need either the Owner or Contributor role on the resource group.
Also, see Azure OpenAI roles for more information.