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openldap client cert validation

Hello,

I am running openldap 2.4.41 and I've failed to setup client certificate
validation. TLS works well until olcTLSVerifyClient is set to demand.
Then I see

ldap_sasl_bind(SIMPLE): Can't contact LDAP server (-1)

at client side.
And

connection_read(11): TLS accept failure error=-1 id=1021, closing

at the serveri side.
So, I've configured /etc/openldap/ldap.conf as the following to provide
client TLS certificate paths:

TLS_CACERT /path/to/myroot.pem
TLS_CACERTDIR /var/lib/ca-certificates/pem/
TLS_CERT /path/to/my.crt
TLS_KEY /path/to/my.key

However, when I run openssl s_server -Verify 0 -accept 636 ...
I see the following:

ERROR
140680155473552:error:140890C7:SSL
routines:SSL3_GET_CLIENT_CERTIFICATE:peer did not return a
certificate:s3_srvr.c:3309:
shutting down SSL
CONNECTION CLOSED
ACCEPT

So, this means that ldapsearch doesn't sent out its client certificate.
I've also checked with strace tool that it even doesn't access
certificate file.

So, I am little stuck here. I understand that I am doing something
wrong, but I cannot figure out what.