Hi @JA ,
quotas can be set on Azure Subscription level only.
There is no option to apply quotas for different Azure Resource Groups.
There are 2 options I can see for your requirement:
Use 2 Azure Subscriptions for each Resource Group
Use the 2 Resource Groups in 2 different regions. There is a quota for vCPUs per region within the same Subscription.
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Regards
Andreas Baumgarten