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I understand that you are encountering an issue, The OpenAI quota request form in Azure gives an error message 'this form is closed'.
The Correct process is to request quota from Quota tab of Azure foundry portal, you can click on request quota for respective model/deployment tab as shown in below screenshot. Reference -
kindly refer below documentation: https://learn.microsoft.com/en-us/azure/ai-services/openai/how-to/quota?tabs=rest#view-and-request-quota
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