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You need to give the delegation a name, so something like:

```const appSubnet = new azure_native.network.Subnet("appSubnet", {
    addressPrefix: "10.1.2.0/24",
    resourceGroupName: resourceGroup.name,
    subnetName: "appSubnet",
    virtualNetworkName: myVirtualNetwork.name,
    delegations: [{
        serviceName : "Microsoft.ContainerInstance/containerGroups",
        name: "name-of-delegation"
    }]
});```

Also, I think the service needs to be the full "type". So if you're using `containerGroups` it would look like my example above, with `Microsoft.ContainerInstance/containerGroups`