Good day all, tried installing k3s on my mac M1 and I have been getting this error "shell failed: instance "k3s-worker" does not exist" whenever I run this command multipass shell k3s-worker.

Give some more details … if you want well rounded answer. Thanks

That looks like you're trying to access the canonical product multipass VM on your cli. so your multipass list command output will show you the name of your local instances that you're trying to SSH into with multipass. That doesn't seem related to a k3s install.