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found it at

sudo cat /var/lib/rancher/k3s/server/token

https://preview.krakensoftware.eu/blogs this might help you setting up, although the blog is far from completed. About 1/5th is posted atm, still working on the rest of it. But please take note that the website is in development, and I had to swiftly create a blog-like system to help a colleague out. I haven't had the time yet to ensure everything is readable.