Try the steps below:
Ensure you're explicitly specifying South Central US as the location for all resources in your code, including any automatically created resource groups or instead of letting the deployment create a new resource group, create one manually in South Central US and specify it in your deployment configuration.
You can also explicitly set the location:
az arcdata control create --name myarcdata --resource-group myresourcegroup --location "South Central US" --connectivity-mode indirect --custom-location mycustomlocation
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Regards,
Abiola