Hi mung,
Thank you for sharing the details. Based on the policy error and your description, your student Azure subscription is restricted to a set of approved regions, including eastus, mexicocentral, centralus, canadacentral, and southcentralus. Although you correctly created your Azure OpenAI resource in the allowed East US region, the Chat Playground interface defaults to East US 2 during deployment, which is not permitted under your policy. Since the region dropdown is disabled in the playground, it forces deployment to a disallowed region and results in failure. Unfortunately, the Chat Playground does not currently support region override for deployments, so this limitation prevents usage through the playground interface. As a workaround, you can interact with your Azure OpenAI deployment using the REST API or SDKs such as Python or Node.js, where you have full control to specify the correct endpoint and deployment in the East US region. This allows you to bypass the playground restriction and continue developing with Azure OpenAI within your permitted regions.