How to switch between users via ssh if the keys were generated in PUTTY?

Question

SSH

In general, the problem is this, I generated keys via PUTTY, then I created a droplet on DigitalOcean, specifying an ssh key, I created a droplet, I go to it via PUTTY: I drive in ip, I specify the path to the key in SSH-Auth, I go to the server, first of all I create a new one user, I give him rights, then I throw in
/.ssh/authorized_keys
on a new user so that he can ssh into him and then there was a problem, when the command
ssh [email protected]
gives an error Permission denied (publickey).
I decided to find out how it is, there are authorized_keys, where does he get the key from then? The team
ssh [email protected] -vfound the following

debug1: Authentications that can continue: publickey
debug1: Next authentication method: publickey
debug1: Trying private key: /root/.ssh/id_rsa
debug1: Trying private key: /root/.ssh/id_dsa
debug1: Trying private key: /root/.ssh/id_ecdsa
debug1: Trying private key: /root/.ssh/id_ed25519
debug1: No more authentication methods to try.
Permission denied (publickey).

I only have authorized_keys and know_hosts in my /.ssh folder, nothing else, maybe I'm stupid and the answer is on the surface, help me figure it out

Answer 1

When you connect to the server via putty, the private key is where the putty is.
And when you have already logged into a remote server, and user1 is trying to connect to user2, then the private keys should be in user1.
You can already generate a new key inside user1, and put the public key from it into user2.
Or convert the private key from putty to ssh format and put it in user1

Answer 2

Are you sure you are adding a key to that user (home/username/.ssh/authorized_keys)?
Well, in order to work from different users, it is not necessary for everyone to generate a key and connect. You can switch in the current session with:
:~$su username