Support request for SSH configuration

I tried the perform the following:

k3sup join --ip 192.168.1.217 --server-ip 192.168.1.199 --user suhr

got the error:
Error: unable to connect to (server) 192.168.1.199:22 over ssh: ssh: handshake failed: ssh: unable to authenticate, attempted methods [none publickey], no supported methods remain

on the server, I see that:
Mar 23 01:03:15 suhr-dt sshd[13518]: Connection closed by authenticating user suhr 192.168.1.217 port 39384 [preauth]

## Why do you need this?
Just trying to set up k3s for learning purpose.

## Expected Behaviour
I expect this to create an agent and connect to server

## Current Behaviour
It complains about some ssh error

## Possible Solution

## Steps to Reproduce

## Your Environment
server is kubuntu 20.04 on x86_64; trying to connect from Raspberry pi4

* k3sup version:

```
k3sup version
```

* What Kubernetes distribution, client and server version are you using?

```
kubectl version
```

* What OS or type or VM are you using for your cluster? Where is it hosted? (for `k3sup install/join`):

* Operating System and version (e.g. Linux, Windows, MacOS):

```
uname -a

cat /etc/os-release
```

## Do you want to work on this?

Subject to design approval, are you willing to work on a Pull Request for this issue or feature request?

- [ ] Yes
- [ ] No