Defender for Key Vaults is set to On (Standard pricing tier)

# Enable Microsoft Defender for Key Vaults (Standard)
resource "azurerm_security_center_subscription_pricing" "example_resource_name" {
  resource_type = "KeyVaults"
  tier          = "Standard" # Critical: sets the plan to Standard (ON)
}

// Enable Microsoft Defender for Key Vaults (Standard tier) at subscription scope
resource example_pricing 'Microsoft.Security/pricings@2023-01-01' = {
  name: 'KeyVaults'
  properties: {
    pricingTier: 'Standard' // Critical: sets the KeyVaults plan to Standard (ON)
  }
}