Azure OpenAI deployment blocked by subscription policy despite supported regions (RequestDisallowedByAzure)

I am unable to deploy any Azure OpenAI model due to a subscription-level policy restriction.

Environment:

• Subscription: Azure for Students
• Azure OpenAI resource successfully created
• Available regions shown in portal: East US 2, Sweden Central and my listofallowedregions are: ["centralindia","eastasia","austriaeast","southeastasia","koreacentral"]
• Models visible in Azure OpenAI Studio (e.g. gpt-35-turbo, gpt-35-turbo-16k)

Issue:

When attempting to create a model deployment (Standard deployment, auto-update to default version), the deployment fails with:

InvalidTemplateDeployment

RequestDisallowedByAzure

“This policy maintains a set of best available regions where your subscription can deploy resources.”

In some cases, the deployment UI appears to succeed, but API calls return:

404 DeploymentNotFound

Important notes:

• This is NOT a model deprecation issue (no existing deployments)
• This is NOT a quota issue
• The error occurs even in regions that are listed as supported and selectable
• Azure CLI deployment commands also fail due to the same policy restriction

Question:

Is Azure OpenAI model deployment restricted by policy for Azure for Students subscriptions, even when the region and model appear available in the portal?

If so:

• Is there any supported way to enable deployments for evaluation or testing?
• Is this expected behavior or a known limitation?

Any clarification from users who have successfully deployed Azure OpenAI on Azure for Students would be helpful.