Dovecot Director Proxy (Error: lmtp-server: conn Failed to initialize user: Namespace '': Mail storage autodetection failed with home=(not set))

[abdelhaq.jalboush--- via dovecot]

dovecot --version     2.3.21 (47349e2482)

I have Postfix and two dovecot directors I am trying to setup them as proxy in 
front of two dovecot backends, I am using openldap, when I set  
passdb {
   driver = static
   args = proxy=y nopassword=y
}

it is working fine.
but If I try to authenticate on the proxy I get this error:
lmtp(22086): Error: lmtp-server: conn  [3]: rcpt : Failed to initialize user: 
Namespace '': Mail storage autodetection failed with home=(not set)

here is my openldap file /etc/dovecot/dovecot-openldap-proxy.conf.ext:

uris = ldaps://
dn = CN=,OU=,DC=,dc=
dnpass = 
debug_level = 0
auth_bind = yes
ldap_version = 3
base = OU=,DC=,dc=
scope = subtree
user_attrs = mail=user
pass_attrs = userPassword=password
pass_filter = (&(objectClass=person)(mail=%u))


 dovecot -n on the director side:

# 2.3.21 (47349e2482): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.5.21 (f6cd4b8e)
# OS: Linux 6.8.0-1018-aws x86_64 Ubuntu 24.04.1 LTS
# Hostname: stg-vm-dir01
auth_debug = yes
auth_mechanisms = plain login
auth_socket_path = director-userdb
auth_verbose = yes
director_mail_servers = 10.100.10.15 10.100.15.16
director_servers = 10.100.15.201 10.100.15.202
info_log_path = /var/log/dovecot.log
listen = *
lmtp_proxy = yes
log_path = /var/log/dovecot.log
mail_gid = vmail
mail_privileged_group = mail
mail_uid = vmail
namespace inbox {
  inbox = yes
  location =
  mailbox Drafts {
    special_use = \Drafts
  }
  mailbox Junk {
    special_use = \Junk
  }
  mailbox Sent {
    special_use = \Sent
  }
  mailbox "Sent Messages" {
    special_use = \Sent
  }
  mailbox Trash {
    special_use = \Trash
  }
  prefix =
}
passdb {
  args = /etc/dovecot/dovecot-openldap-proxy.conf.ext
  driver = ldap
}
protocols = imap pop3 lmtp
service director {
  fifo_listener login/proxy-notify {
    mode = 0600
    user = $default_login_user
  }
  inet_listener {
    port = 9090
  }
  unix_listener director-admin {
    mode = 0600
  }
  unix_listener director-userdb {
    mode = 0600
  }
  unix_listener login/director {
    mode = 0666
  }
}
service imap-login {
  executable = imap-login director
  inet_listener imap {
    port = 0
  }
  inet_listener imaps {
    port = 993
    ssl = yes
  }
}
service ipc {
  unix_listener ipc {
    user = dovecot
  }
}
service lmtp {
  inet_listener lmtp {
    port = 24
  }
}
service pop3-login {
  executable = pop3-login director
  inet_listener pop3 {
    port = 0
  }
  inet_listener pop3s {
    port = 995
    ssl = yes
  }
}
service submission-login {
  inet_listener submission {
    port = 587
  }
}
ssl_cert = </etc/dovecot/ssl/fullchain.pem
ssl_client_ca_dir = /etc/ssl/certs
ssl_dh = # hidden, use -P to show it
ssl_key = # hidden, use -P to show it
protocol lmtp {
  auth_socket_path = director-userdb
}
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