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Looks like you aren't specifying a k8s version so it defaults to the latest. In this case looks like latest version doesn't support beta api you were leveraging.

yeah, it deploys a .23, my existing ones are .21. But this means the “defaults” of the eks package are broken

Are you using the latest version of the aws pulumi package?

yes
```    "@pulumi/aws": "5.28.0",
    "@pulumi/awsx": "1.0.1",
    "@pulumi/eks": "1.0.1",```

Not with Pulumi myself , but need to make  a cluster later today so I'll comment back if I run into the same issue

adding useDefaultVpcCni: true, makes it work