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

I've had exact problem like a week ago

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