authentication failure

Hello,

I have almost 80 user mailboxes and they are working without problems 
but one of them is unable to login. There was some creation and deletion 
procedures of this mailbox and a moment with two users with this same 
mailbox.

Now imap log messages for this mailbox are:

Mar 10 12:31:46 mailserver imaps[31916]: ptload(): bad response from 
ptloader server: identifier not found
Mar 10 12:31:46 mailserver imaps[31916]: ptload failed: but canonified 
[email protected] -> [email protected]
Mar 10 12:31:46 mailserver imaps[31916]: SASL Password verification failed
Mar 10 12:31:52 mailserver imaps[31916]: badlogin: [127.0.0.1] 
[email protected] LOGIN+TLS SASL(-13): authentication failure: 
checkpass failed

/var/log/roundcubemail/userlogins

[10-Mar-2020 09:24:44,911336 +0200]: <uhnjbkbu> Failed login for 
[email protected] from 213.91.180.10 in session uhnjbkbun4mi99i2 
(error: 0)
[10-Mar-2020 09:25:11,060699 +0200]: <uhnjbkbu> Failed login for 
[email protected] from 213.91.180.10 in session uhnjbkbun4mi99i2 (No 
user record found)

/var/log/dirsrv/slapd-mailserver/access

[10/Mar/2020:13:12:08.323708292 +0200] conn=194649 op=1 BIND 
dn="uid=username,ou=People,dc=example,dc=com" method=128 version=3
[10/Mar/2020:13:12:08.324133667 +0200] conn=194649 op=1 RESULT err=49 
tag=97 nentries=0 etime=0.0000506992 - Invalid credentials

but

# testsaslauthd -u [email protected] -p IpCZvSw6d254
0: OK "Success."

kolab lm shows user/[email protected] mailbox. There are folders in 
/var/spool/imap/domain/......./user/username

There was second mailbox [email protected] without children wich I 
removed using cyradm (not using "kolab dm")

Please help me to resolve this authentication failure!

Regards!
Valentin