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maybe this will help? https://www.suse.com/suse-rancher/support-matrix/all-supported-versions/rancher-v2-6-7/

I replied in your another message 🙂

Thanks! I'm still trying to determine if 2.5.17 to 2.6.11 update where my local upstream cluster supports v1.20.15-rancher2-2 but my downstream clusters are still using v1.20.15-rancher2-1 would cause my clusters to be stuck in a "Not Reported" state.

Perhaps go to 2.6.4 ? https://www.suse.com/assets/EN-Rancherv2.6.4-150422-0151-56.pdf

I do have a non prod setup. In the process of standing up the downstream clusters now. I was going to try to go to 2.6.7-rc9 with rke 1.3.13-rc8