Problem accessing MySQL in Xampp

I installed Xampp on my Ubuntu 22.04 box. In its my.cnf, I set

[client]
password =mypassword
port     =3306
socket	 =/opt/lampp/var/mysql/mysql.sock

I saved this and restarted MySQL. When I try Ubuntu's mysql client:

$ mysql --host=localhost --port=3306 -u root -p -S /opt/lampp/var/mysql/mysql.sock

it asked for a password where I gave the configured password but it said

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

What do I need to make this work?