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For Kubernetes in general, you typically can’t upgrade an existing cluster across multiple minor versions like that. I don’t know if this applies to EKS or not, but you may need to take a stepwise approach (1.24->1.25, 1.25->1.26, etc.).

Oh, I maybe should have mentioned that I tried going stepwise and went from

1.24

to

1.25

and got the same error

Ah, I must’ve missed that, my apologies! In that case, I would add your information to the above issue (it does sound like this is related to your problem). In the meantime---and I recognize this isn’t the ideal path---I’d start looking to migrate from your old cluster to a new cluster.