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It seems all I was missing was to:

k3s certificate rotate

although this worked for you, if I remember correctly changing cidr after cluster is created is not supported... you may want to double check the docs

Changing the pod cidr, definitely. Changing the service cidr... That seems to work after rotating certificates

thanks - this is good to know - incase if I ever have to do that 🙂

It gets trickier if you're using things like multus. Ask me how I know 🤣

we live and learn