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```
// Make an EIP for the NAT Gateway
natEIP, err := ec2.NewEip(ctx, "NATEIP", &amp;ec2.EipArgs{
    PublicIpv4Pool: "amazon",
    Vpc:            true,
})

// Make a NAT gateway
natGateway, err := ec2.NewNatGateway(ctx, "NATGateway", &amp;ec2.NatGatewayArgs{
    AllocationId: natEIP.AllocationId(),
    SubnetId:     publicSubnet.ID(),
}
```

======== ERROR MESSAGE ========
```
Diagnostics:
  aws:ec2:NatGateway (NATGateway):
    error: aws:ec2/natGateway:NatGateway resource 'NATGateway' has a problem: "allocation_id": required field is not set
```

The EIP is being created and I can see the allocation id inside the AWS console

It appears that `natEIP.AllocationId()` is undefined for this type of `Eip` resource.  Instead, you need to use `natEIP.ID()`.  Can't explain why that is the API design personally - but it is the pattern used here <https://pulumi.io/reference/pkg/nodejs/@pulumi/aws/ec2/#example-usage-10> and I tried it in Go and it worked.

Huh how weird! I'll give it a try, thanks!