Issue with masterauth

Hello,

I would like to setup masterauth account to be able to connect to imap to log in as other users without password.

My users are currently setup in LDAP and it is working correctly.

I follow the page https://doc.dovecot.org/configuration_manual/authentication/master_users/ to setup this but I think I forgot something.

When I try to login with telnet: Master user logging in as toto => it seems that i can connect with master user ldap(toto,127.0.0.1,): invalid credentials => however ldap is request for password check, why ?

Normmally the goal of master user is to not specify the password of the final user...

Thanks.