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`Subnet` has a `NetworkSecurityGroup` property. You set its `Id` to the NSG ID.

and it became even more complicated :slightly_smiling_face: as it wants not an Id anymore:
`var subnet1 = new Subnet("domain", new Pulumi.AzureNextGen.Network.Latest.SubnetArgs`
        {
            ResourceGroupName = _resourceGroup.Name,
            VirtualNetworkName = network.Name,
            AddressPrefixes = "10.10.1.0/24",
            NetworkSecurityGroup = _nsg,            
        });

VSCode says on _nsg:
Cannot implicitly convert type 'Pulumi.AzureNextGen.Network.Latest.NetworkSecurityGroup' to 'Pulumi.Input&lt;Pulumi.AzureNextGen.Network.Latest.Inputs.NetworkSecurityGroupArgs&gt;'

It does want an Id inside an args class, and it tells you so :wink:
```var subnet1 = new Subnet("domain", new Pulumi.AzureNextGen.Network.Latest.SubnetArgs
{
    ResourceGroupName = _resourceGroup.Name,
    VirtualNetworkName = network.Name,
    AddressPrefixes = "10.10.1.0/24",
    NetworkSecurityGroup = new NetworkSecurityGroupArgs
    {
        Id = nsg.Id
    },            
});```

Mind that `NetworkSecurityGroupArgs` is from the `Inputs` namespace

yes, thanks for noting this. Moving to LB config :slightly_smiling_face: