I'd recommend opening a ticket with Azure Billing Support:
https://azure.microsoft.com/en-ca/support/create-ticket
If this is helpful please accept answer.
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Just shifted to Pay-as-you-go subscription, the first thing I want to do is Add Budget, just after creation of resource group. But it's not allowing me to Add one due to
Error:
Not supported
Cost Management budgets is not supported for this account. Please change to another scope.
Learn more
Even after seleting the scope with paid scubscription.
I'd recommend opening a ticket with Azure Billing Support:
https://azure.microsoft.com/en-ca/support/create-ticket
If this is helpful please accept answer.