Hi Jonathan,
Are you able to open Cost Management and set the scope to your Pay-As-You-Go subscription? For example, open Cost Management Budgets using link below, then click on Scope and set the scope to be the correct subscription:
https://portal.azure.com/#view/Microsoft_Azure_CostManagement/Menu/~/budgets/openedBy/AzurePortal
If the above is useful please click Accept Answer.
Thanks.
-TP