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According to https://www.suse.com/suse-rancher/support-matrix/all-supported-versions/rancher-v2-7-6/ this is not supported anymore. Maybe you're lucky and it works. You should update those clusters (and probably also the OS they are running on)!

Thanks yes I will, but some of them are K3OS and there are no more updates available. I’ve had 1.19 and 1.20 running underneath 2.6, so I think it should be okay for my purposes. I’ll get them all up to 1.22 at least.