Roundcube webmail on Debian 11 bullseye - Could not save password

first question here, take me slow.

I have installed dovecot, postfix and Roundcube webmail in a VM to test a new mail server for the company I work for. All good until I try changing a password as a logged in user from roundcube settings->password.

What I have done:

• Enabled password plugin in roundcube
• Set the driver to "chpasswd" as my users are system users created with "useradd -m user password"
• I have created a new file in sudoers.d and added this www-data ALL=NOPASSWD:/usr/sbin/chpasswd as I understand apache2 runs under www-data user and it need sudo privileges. Still after doing all these things, I get the same error "Could not save password"

No logs that I can find show me other information about the problem. If there is a specific log I should look into, please tell me and I will do. If any configuration should I provide to you, ask and I will provide. Thank you!

EDIT: auth.log shows this when using sudo -u www-data /usr/sbin/chpasswd

sudo: pam_unix(sudo:session): session opened for user www-data(uid=33) by (uid=0)
Feb  2 11:08:54 mail unix_chkpwd[7140]: check pass; user unknown
Feb  2 11:08:54 mail unix_chkpwd[7141]: check pass; user unknown
Feb  2 11:08:54 mail unix_chkpwd[7141]: password check failed for user (test2)
Feb  2 11:08:54 mail chpasswd[7139]: pam_unix(chpasswd:chauthtok): authentication failure; logname= uid=33 euid=33 tty= ruser= rhost=  user=test2
Feb  2 11:09:01 mail CRON[7144]: pam_unix(cron:session): session opened for user root(uid=0) by (uid=0)
Feb  2 11:09:01 mail CRON[7144]: pam_unix(cron:session): session closed for user root
Feb  2 11:09:05 mail sudo: pam_unix(sudo:session): session closed for user www-data

Check in config.inc.php how is logiin file or syslog

// LOGGING
$config['log_driver'] = 'file'; 
$config['syslog_facility'] = error.log;

then check syslog or roundcube log Dir for errors, if is file type of logging should be /var/www/html/roundcube/logs

Update: Probably user www-data don't have permissions for sudo or command to check:

sudo -u www-data /usr/sbin/chpasswd

Try this: https://www.tecmint.com/fix-passwd-authentication-token-manipulation-error-in-linux/