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this is a bug. appears UI was not updated when we GA’d support for flannel on windows. https://github.com/rancher/dashboard/blob/3567111c26d19a974aa69919ec321081a198e1e9/shell/models/provisioning.cattle.io.cluster.js#L853-L855

Thanks for very much for looking into this and logging the bug! Are you aware of any workaround for this bug?

not if you want to use the UI, no

I see. Can it be built from Linux node registration command?