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You will receive this error when you exceed the limit of cores for a region. You need to raise a support ticket to increase the limit of the number of cores for a southcentralus region.
However, please note that free subscriptions including Azure Free Account and Azure for Students aren't eligible for limit or quota increases. If you have a free subscription, you can upgrade to a Pay-As-You-Go.
Once you have upgraded to a Pay-As-You-Go subscription, you can raise a support ticket to increase the limit of the number of cores for the southcentralus region.
Reference: Resolve errors for resource quotas
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