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If your Azure Student account has zero quota and you do not have the option to request an increase, it may be due to specific regional restrictions or limitations set by Microsoft for that particular subscription. Azure Student accounts can sometimes have different quota limits based on the region where the account is registered.
Unfortunately, you cannot use your existing Azure Student credits to buy additional quota. Quotas are set limits on the number of resources you can use, and they are not directly purchasable with credits. If you need more resources, you may consider upgrading to a pay-as-you-go subscription, which would allow you to access additional resources and quotas.
For further assistance, you might want to contact Azure support to clarify your specific situation regarding quotas and any potential options available to you.
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