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If you are unable to select the South India region in the quota request form under your MPN subscription, you will need to submit a region access request. This request should specify the vCores you want to utilize for your B2als v2 VM deployment. Additionally, if your subscription is part of Azure Program offerings, you may have access to a limited set of regions and might need to opt for an alternate region if access to South India cannot be granted.
Once you submit your request, it will undergo review, and you will receive a response based on the information provided in the form.