I just upgraded to 224. I am seeing the same issue as many others, cannot upgrade further, so I wanted to ssh and do ldconfig.
I enabled SSH via ip/dev page.
But it seems like when you changed Volumio to have ssh disabled by default, you also changed or deleted keys! When I use my key I get authentication failure, when I force it not to use keys I am prompted for password, but I have no idea what I changed it to. Could you please confirm you changed/deleted keys? Or do I miss something obvious?
Did you try the default user/pw (volumio)?