There is no Azure subscription key - presumably you're referring to Azure subscription id. For that, refer to https://learn.microsoft.com/en-us/answers/questions/1481572/help-find-my-subscription-id
There is also no Azure service region - Azure is a global public cloud - it supports multiple regions. For that, refer to https://learn.microsoft.com/en-us/azure/cloud-adoption-framework/ready/azure-setup-guide/regions
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hth
Marcin