New user with openSSH

Hi, I am running a dietpi system on rp4 with openSSH. I have the following issue:
Users that has been added with Dropbear, before changing to openSSH can have and ssh access without an issue, however after the installation of openSSH new user can not login with “Permission denied (publickey,password)” . It is happening after using adduser, useradd or useradd -m commands. I have changed /etc/ssh/ssh_config file adding at the end “Match User newuser
PasswordAuthentication yes”
What do i do wrong or what is the solution? I need the openSSh because i have installed OMV.
Thank you