Some of my users need to connect using SFTP via public key. I tried but it does not work. Tried looking at official documentation but still unable to get it working.

Here is what I did:

1. Test environment using ubuntu.
2. using my user, I generated ssh key with command: keygen -t rsa -b 3072
3. after can copy the id_rsa.pub content into my user in SFTPGo.
   Example: ssh-rsa AAAAB3NzaC1yc2Exxxxxxxxxxxxxx username@ubun
4. tried to SFTP command from ubuntu: sftp -P 2022 username@1.2.3.4

It still prompt me for password.