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looks like the instructions are setting `ssh_key` as a list, when in reality, the underlying terraform only accepts one item `<https://www.terraform.io/docs/providers/azurerm/r/kubernetes_cluster.html> "Only one is currently allowed. "`

i cant recall. there was something else to this

but this code was frozen for couple of months

i dont know, its really weird. sorry for that. I've created a PR to fix that

in my code its `[{}]` everywhere. and I tested it several times before submitting a pr to create that article. that is weird