Managesieve and virtual users

[CP]

Hello list,

I'm trying to setup sieve on a Debian 9 install with virtual users.
Perhaps I'm getting old, but I can't figure out why managesieve is
not working for virtual users. I have about 20 v users on this machine
and only one has also a real unix account. The sieve rules work for this
single unix account  but not for any other account.
I have read tried various HOWTO's found on the net like this :

https://forum.vestacp.com/viewtopic.php?t=11363

but nothing is working for my case, so something is wrong in my setup and I
hope you guys might shed some light .
The setup is rather simple it's 20 v users with one public folder , I 
have tried both
dovecot lda and lmtp .

doveconf -n  included

Thanks in advance for any help
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# 2.2.27 (c0f36b0): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.4.16 (fed8554)
# OS: Linux 4.9.0-3-amd64 x86_64 Debian 9.1 ext4
auth_mechanisms = plain login
auth_verbose = yes
auth_verbose_passwords = yes
disable_plaintext_auth = no
log_path = /var/log/dovecot.log
mail_location = maildir:/home/vmail/%d/%n/Maildir
mail_plugins = acl virtual
mail_privileged_group = mail
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date index ihave duplicate mime foreverypart extracttext
namespace {
  hidden = no
  list = yes
  location = maildir:/home/vmail/%d/company:INDEXPVT=/home/vmail/%d/%n/Maildir/company
  prefix = company/
  separator = /
  subscriptions = no
  type = public
}
namespace inbox {
  inbox = yes
  location =
  mailbox "Deleted Items" {
    special_use = \Trash
  }
  mailbox Drafts {
    special_use = \Drafts
  }
  mailbox Junk {
    special_use = \Junk
  }
  mailbox "Junk E-mail" {
    special_use = \Junk
  }
  mailbox "Junk Email" {
    special_use = \Junk
  }
  mailbox Sent {
    special_use = \Sent
  }
  mailbox "Sent Items" {
    special_use = \Sent
  }
  mailbox "Sent Messages" {
    special_use = \Sent
  }
  mailbox Trash {
    special_use = \Trash
  }
  prefix = 
  separator = /
  type = private
}
passdb {
  args = /etc/dovecot/conf.d/dovecot-sql.conf.ext
  driver = sql
}
plugin {
  acl = vfile
  acl_anyone = allow
  sieve = file:/home/vmail/%d/%n/sieve;active=/home/vmail/%d/%n/.dovecot.sieve
  sieve_user_log = file:/home/vmail/%d/%n/sieve/sieve_error.log
}
protocols = imap pop3 lmtp sieve
service auth-worker {
  user = vmail
}
service auth {
  inet_listener {
    port = 12345
  }
  unix_listener /var/spool/postfix/private/auth {
    group = postfix
    mode = 0666
    user = postfix
  }
  unix_listener auth-userdb {
    mode = 0600
    user = vmail
  }
  user = dovecot
}
service imap-login {
  inet_listener imap {
    port = 143
  }
}
service lmtp {
  unix_listener /var/spool/postfix/private/dovecot-lmtp {
    group = postfix
    mode = 0600
    user = postfix
 }
}
service managesieve-login {
  inet_listener sieve {
    port = 4190
  }
}
service pop3-login {
  inet_listener pop3 {
    port = 110
  }
}
ssl_cert = </etc/ssl/certs/dovecot.pem
ssl_key =  # hidden, use -P to show it
userdb {
  args = uid=vmail gid=vmail home=/home/vmail/%d/%n/Maildir
  driver = static
}
protocol lmtp {
  mail_plugins = acl virtual sieve
}
protocol lda {
  mail_plugins = acl virtual sieve
}
protocol imap {
  mail_max_userip_connections = 30
  mail_plugins = acl virtual imap_acl
}