Enable ssh login with password for a user

I am the admin of a Ubuntu 20.04 server and I want to enable ssh login for a user through password, rather than using key pairs.

The /etc/ssh/ssh_config file on the host looks like this (<username> is replaced by its actual username):

Host*    SendEnv LANG LC_*    HashKnownHosts yes    GSSAPIAuthentication yesMatch User <username>    PubkeyAuthentication no    PreferredAuthentications password    PasswordAuthentication yes

Still, when he tries to login as:

ssh \<username>@\<host>

he receive an error:

Permission denied (publickey)

What am I doing wrong?